# Copyright 2009-present MongoDB, Inc. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """Collection level utilities for Mongo.""" import datetime import warnings from bson.code import Code from bson.objectid import ObjectId from bson.py3compat import (_unicode, abc, integer_types, string_type) from bson.raw_bson import RawBSONDocument from bson.codec_options import CodecOptions from bson.son import SON from pymongo import (common, helpers, message) from pymongo.bulk import BulkOperationBuilder, _Bulk from pymongo.command_cursor import CommandCursor, RawBatchCommandCursor from pymongo.common import ORDERED_TYPES from pymongo.collation import validate_collation_or_none from pymongo.change_stream import CollectionChangeStream from pymongo.cursor import Cursor, RawBatchCursor from pymongo.errors import (BulkWriteError, ConfigurationError, InvalidName, OperationFailure) from pymongo.helpers import (_check_write_command_response, _raise_last_error) from pymongo.message import _UNICODE_REPLACE_CODEC_OPTIONS from pymongo.operations import IndexModel from pymongo.read_preferences import ReadPreference from pymongo.results import (BulkWriteResult, DeleteResult, InsertOneResult, InsertManyResult, UpdateResult) from pymongo.write_concern import WriteConcern _NO_OBJ_ERROR = "No matching object found" _UJOIN = u"%s.%s" class ReturnDocument(object): """An enum used with :meth:`~pymongo.collection.Collection.find_one_and_replace` and :meth:`~pymongo.collection.Collection.find_one_and_update`. """ BEFORE = False """Return the original document before it was updated/replaced, or ``None`` if no document matches the query. """ AFTER = True """Return the updated/replaced or inserted document.""" class Collection(common.BaseObject): """A Mongo collection. """ def __init__(self, database, name, create=False, codec_options=None, read_preference=None, write_concern=None, read_concern=None, session=None, **kwargs): """Get / create a Mongo collection. Raises :class:`TypeError` if `name` is not an instance of :class:`basestring` (:class:`str` in python 3). Raises :class:`~pymongo.errors.InvalidName` if `name` is not a valid collection name. Any additional keyword arguments will be used as options passed to the create command. See :meth:`~pymongo.database.Database.create_collection` for valid options. If `create` is ``True``, `collation` is specified, or any additional keyword arguments are present, a ``create`` command will be sent, using ``session`` if specified. Otherwise, a ``create`` command will not be sent and the collection will be created implicitly on first use. The optional ``session`` argument is *only* used for the ``create`` command, it is not associated with the collection afterward. :Parameters: - `database`: the database to get a collection from - `name`: the name of the collection to get - `create` (optional): if ``True``, force collection creation even without options being set - `codec_options` (optional): An instance of :class:`~bson.codec_options.CodecOptions`. If ``None`` (the default) database.codec_options is used. - `read_preference` (optional): The read preference to use. If ``None`` (the default) database.read_preference is used. - `write_concern` (optional): An instance of :class:`~pymongo.write_concern.WriteConcern`. If ``None`` (the default) database.write_concern is used. - `read_concern` (optional): An instance of :class:`~pymongo.read_concern.ReadConcern`. If ``None`` (the default) database.read_concern is used. - `collation` (optional): An instance of :class:`~pymongo.collation.Collation`. If a collation is provided, it will be passed to the create collection command. This option is only supported on MongoDB 3.4 and above. - `session` (optional): a :class:`~pymongo.client_session.ClientSession` that is used with the create collection command - `**kwargs` (optional): additional keyword arguments will be passed as options for the create collection command .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.4 Support the `collation` option. .. versionchanged:: 3.2 Added the read_concern option. .. versionchanged:: 3.0 Added the codec_options, read_preference, and write_concern options. Removed the uuid_subtype attribute. :class:`~pymongo.collection.Collection` no longer returns an instance of :class:`~pymongo.collection.Collection` for attribute names with leading underscores. You must use dict-style lookups instead:: collection['__my_collection__'] Not: collection.__my_collection__ .. versionchanged:: 2.2 Removed deprecated argument: options .. versionadded:: 2.1 uuid_subtype attribute .. mongodoc:: collections """ super(Collection, self).__init__( codec_options or database.codec_options, read_preference or database.read_preference, write_concern or database.write_concern, read_concern or database.read_concern) if not isinstance(name, string_type): raise TypeError("name must be an instance " "of %s" % (string_type.__name__,)) if not name or ".." in name: raise InvalidName("collection names cannot be empty") if "$" in name and not (name.startswith("oplog.$main") or name.startswith("$cmd")): raise InvalidName("collection names must not " "contain '$': %r" % name) if name[0] == "." or name[-1] == ".": raise InvalidName("collection names must not start " "or end with '.': %r" % name) if "\x00" in name: raise InvalidName("collection names must not contain the " "null character") collation = validate_collation_or_none(kwargs.pop('collation', None)) self.__database = database self.__name = _unicode(name) self.__full_name = _UJOIN % (self.__database.name, self.__name) if create or kwargs or collation: self.__create(kwargs, collation, session) self.__write_response_codec_options = self.codec_options._replace( unicode_decode_error_handler='replace', document_class=dict) def _socket_for_reads(self, session): return self.__database.client._socket_for_reads( self._read_preference_for(session)) def _socket_for_primary_reads(self, session): read_pref = ((session and session._txn_read_preference()) or ReadPreference.PRIMARY) return self.__database.client._socket_for_reads(read_pref), read_pref def _socket_for_writes(self): return self.__database.client._socket_for_writes() def _command(self, sock_info, command, slave_ok=False, read_preference=None, codec_options=None, check=True, allowable_errors=None, read_concern=None, write_concern=None, collation=None, session=None, retryable_write=False): """Internal command helper. :Parameters: - `sock_info` - A SocketInfo instance. - `command` - The command itself, as a SON instance. - `slave_ok`: whether to set the SlaveOkay wire protocol bit. - `codec_options` (optional) - An instance of :class:`~bson.codec_options.CodecOptions`. - `check`: raise OperationFailure if there are errors - `allowable_errors`: errors to ignore if `check` is True - `read_concern` (optional) - An instance of :class:`~pymongo.read_concern.ReadConcern`. - `write_concern`: An instance of :class:`~pymongo.write_concern.WriteConcern`. This option is only valid for MongoDB 3.4 and above. - `collation` (optional) - An instance of :class:`~pymongo.collation.Collation`. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. :Returns: The result document. """ with self.__database.client._tmp_session(session) as s: return sock_info.command( self.__database.name, command, slave_ok, read_preference or self._read_preference_for(session), codec_options or self.codec_options, check, allowable_errors, read_concern=read_concern, write_concern=write_concern, parse_write_concern_error=True, collation=collation, session=s, client=self.__database.client, retryable_write=retryable_write) def __create(self, options, collation, session): """Sends a create command with the given options. """ cmd = SON([("create", self.__name)]) if options: if "size" in options: options["size"] = float(options["size"]) cmd.update(options) with self._socket_for_writes() as sock_info: self._command( sock_info, cmd, read_preference=ReadPreference.PRIMARY, write_concern=self._write_concern_for(session), collation=collation, session=session) def __getattr__(self, name): """Get a sub-collection of this collection by name. Raises InvalidName if an invalid collection name is used. :Parameters: - `name`: the name of the collection to get """ if name.startswith('_'): full_name = _UJOIN % (self.__name, name) raise AttributeError( "Collection has no attribute %r. To access the %s" " collection, use database['%s']." % ( name, full_name, full_name)) return self.__getitem__(name) def __getitem__(self, name): return Collection(self.__database, _UJOIN % (self.__name, name), False, self.codec_options, self.read_preference, self.write_concern, self.read_concern) def __repr__(self): return "Collection(%r, %r)" % (self.__database, self.__name) def __eq__(self, other): if isinstance(other, Collection): return (self.__database == other.database and self.__name == other.name) return NotImplemented def __ne__(self, other): return not self == other @property def full_name(self): """The full name of this :class:`Collection`. The full name is of the form `database_name.collection_name`. """ return self.__full_name @property def name(self): """The name of this :class:`Collection`.""" return self.__name @property def database(self): """The :class:`~pymongo.database.Database` that this :class:`Collection` is a part of. """ return self.__database def with_options( self, codec_options=None, read_preference=None, write_concern=None, read_concern=None): """Get a clone of this collection changing the specified settings. >>> coll1.read_preference Primary() >>> from pymongo import ReadPreference >>> coll2 = coll1.with_options(read_preference=ReadPreference.SECONDARY) >>> coll1.read_preference Primary() >>> coll2.read_preference Secondary(tag_sets=None) :Parameters: - `codec_options` (optional): An instance of :class:`~bson.codec_options.CodecOptions`. If ``None`` (the default) the :attr:`codec_options` of this :class:`Collection` is used. - `read_preference` (optional): The read preference to use. If ``None`` (the default) the :attr:`read_preference` of this :class:`Collection` is used. See :mod:`~pymongo.read_preferences` for options. - `write_concern` (optional): An instance of :class:`~pymongo.write_concern.WriteConcern`. If ``None`` (the default) the :attr:`write_concern` of this :class:`Collection` is used. - `read_concern` (optional): An instance of :class:`~pymongo.read_concern.ReadConcern`. If ``None`` (the default) the :attr:`read_concern` of this :class:`Collection` is used. """ return Collection(self.__database, self.__name, False, codec_options or self.codec_options, read_preference or self.read_preference, write_concern or self.write_concern, read_concern or self.read_concern) def initialize_unordered_bulk_op(self, bypass_document_validation=False): """**DEPRECATED** - Initialize an unordered batch of write operations. Operations will be performed on the server in arbitrary order, possibly in parallel. All operations will be attempted. :Parameters: - `bypass_document_validation`: (optional) If ``True``, allows the write to opt-out of document level validation. Default is ``False``. Returns a :class:`~pymongo.bulk.BulkOperationBuilder` instance. See :ref:`unordered_bulk` for examples. .. note:: `bypass_document_validation` requires server version **>= 3.2** .. versionchanged:: 3.5 Deprecated. Use :meth:`~pymongo.collection.Collection.bulk_write` instead. .. versionchanged:: 3.2 Added bypass_document_validation support .. versionadded:: 2.7 """ warnings.warn("initialize_unordered_bulk_op is deprecated", DeprecationWarning, stacklevel=2) return BulkOperationBuilder(self, False, bypass_document_validation) def initialize_ordered_bulk_op(self, bypass_document_validation=False): """**DEPRECATED** - Initialize an ordered batch of write operations. Operations will be performed on the server serially, in the order provided. If an error occurs all remaining operations are aborted. :Parameters: - `bypass_document_validation`: (optional) If ``True``, allows the write to opt-out of document level validation. Default is ``False``. Returns a :class:`~pymongo.bulk.BulkOperationBuilder` instance. See :ref:`ordered_bulk` for examples. .. note:: `bypass_document_validation` requires server version **>= 3.2** .. versionchanged:: 3.5 Deprecated. Use :meth:`~pymongo.collection.Collection.bulk_write` instead. .. versionchanged:: 3.2 Added bypass_document_validation support .. versionadded:: 2.7 """ warnings.warn("initialize_ordered_bulk_op is deprecated", DeprecationWarning, stacklevel=2) return BulkOperationBuilder(self, True, bypass_document_validation) def bulk_write(self, requests, ordered=True, bypass_document_validation=False, session=None): """Send a batch of write operations to the server. Requests are passed as a list of write operation instances ( :class:`~pymongo.operations.InsertOne`, :class:`~pymongo.operations.UpdateOne`, :class:`~pymongo.operations.UpdateMany`, :class:`~pymongo.operations.ReplaceOne`, :class:`~pymongo.operations.DeleteOne`, or :class:`~pymongo.operations.DeleteMany`). >>> for doc in db.test.find({}): ... print(doc) ... {u'x': 1, u'_id': ObjectId('54f62e60fba5226811f634ef')} {u'x': 1, u'_id': ObjectId('54f62e60fba5226811f634f0')} >>> # DeleteMany, UpdateOne, and UpdateMany are also available. ... >>> from pymongo import InsertOne, DeleteOne, ReplaceOne >>> requests = [InsertOne({'y': 1}), DeleteOne({'x': 1}), ... ReplaceOne({'w': 1}, {'z': 1}, upsert=True)] >>> result = db.test.bulk_write(requests) >>> result.inserted_count 1 >>> result.deleted_count 1 >>> result.modified_count 0 >>> result.upserted_ids {2: ObjectId('54f62ee28891e756a6e1abd5')} >>> for doc in db.test.find({}): ... print(doc) ... {u'x': 1, u'_id': ObjectId('54f62e60fba5226811f634f0')} {u'y': 1, u'_id': ObjectId('54f62ee2fba5226811f634f1')} {u'z': 1, u'_id': ObjectId('54f62ee28891e756a6e1abd5')} :Parameters: - `requests`: A list of write operations (see examples above). - `ordered` (optional): If ``True`` (the default) requests will be performed on the server serially, in the order provided. If an error occurs all remaining operations are aborted. If ``False`` requests will be performed on the server in arbitrary order, possibly in parallel, and all operations will be attempted. - `bypass_document_validation`: (optional) If ``True``, allows the write to opt-out of document level validation. Default is ``False``. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. :Returns: An instance of :class:`~pymongo.results.BulkWriteResult`. .. seealso:: :ref:`writes-and-ids` .. note:: `bypass_document_validation` requires server version **>= 3.2** .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.2 Added bypass_document_validation support .. versionadded:: 3.0 """ common.validate_list("requests", requests) blk = _Bulk(self, ordered, bypass_document_validation) for request in requests: try: request._add_to_bulk(blk) except AttributeError: raise TypeError("%r is not a valid request" % (request,)) write_concern = self._write_concern_for(session) bulk_api_result = blk.execute(write_concern, session) if bulk_api_result is not None: return BulkWriteResult(bulk_api_result, True) return BulkWriteResult({}, False) def _legacy_write(self, sock_info, name, cmd, op_id, bypass_doc_val, func, *args): """Internal legacy unacknowledged write helper.""" # Cannot have both unacknowledged write and bypass document validation. if bypass_doc_val and sock_info.max_wire_version >= 4: raise OperationFailure("Cannot set bypass_document_validation with" " unacknowledged write concern") listeners = self.database.client._event_listeners publish = listeners.enabled_for_commands if publish: start = datetime.datetime.now() args = args + (sock_info.compression_context,) rqst_id, msg, max_size = func(*args) if publish: duration = datetime.datetime.now() - start listeners.publish_command_start( cmd, self.__database.name, rqst_id, sock_info.address, op_id) start = datetime.datetime.now() try: result = sock_info.legacy_write(rqst_id, msg, max_size, False) except Exception as exc: if publish: dur = (datetime.datetime.now() - start) + duration if isinstance(exc, OperationFailure): details = exc.details # Succeed if GLE was successful and this is a write error. if details.get("ok") and "n" in details: reply = message._convert_write_result( name, cmd, details) listeners.publish_command_success( dur, reply, name, rqst_id, sock_info.address, op_id) raise else: details = message._convert_exception(exc) listeners.publish_command_failure( dur, details, name, rqst_id, sock_info.address, op_id) raise if publish: if result is not None: reply = message._convert_write_result(name, cmd, result) else: # Comply with APM spec. reply = {'ok': 1} duration = (datetime.datetime.now() - start) + duration listeners.publish_command_success( duration, reply, name, rqst_id, sock_info.address, op_id) return result def _insert_one( self, doc, ordered, check_keys, manipulate, write_concern, op_id, bypass_doc_val, session): """Internal helper for inserting a single document.""" if manipulate: doc = self.__database._apply_incoming_manipulators(doc, self) if not isinstance(doc, RawBSONDocument) and '_id' not in doc: doc['_id'] = ObjectId() doc = self.__database._apply_incoming_copying_manipulators(doc, self) write_concern = write_concern or self.write_concern acknowledged = write_concern.acknowledged command = SON([('insert', self.name), ('ordered', ordered), ('documents', [doc])]) if not write_concern.is_server_default: command['writeConcern'] = write_concern.document def _insert_command(session, sock_info, retryable_write): if not sock_info.op_msg_enabled and not acknowledged: # Legacy OP_INSERT. return self._legacy_write( sock_info, 'insert', command, op_id, bypass_doc_val, message.insert, self.__full_name, [doc], check_keys, False, write_concern.document, False, self.__write_response_codec_options) if bypass_doc_val and sock_info.max_wire_version >= 4: command['bypassDocumentValidation'] = True result = sock_info.command( self.__database.name, command, write_concern=write_concern, codec_options=self.__write_response_codec_options, check_keys=check_keys, session=session, client=self.__database.client, retryable_write=retryable_write) _check_write_command_response(result) self.__database.client._retryable_write( acknowledged, _insert_command, session) if not isinstance(doc, RawBSONDocument): return doc.get('_id') def _insert(self, docs, ordered=True, check_keys=True, manipulate=False, write_concern=None, op_id=None, bypass_doc_val=False, session=None): """Internal insert helper.""" if isinstance(docs, abc.Mapping): return self._insert_one( docs, ordered, check_keys, manipulate, write_concern, op_id, bypass_doc_val, session) ids = [] if manipulate: def gen(): """Generator that applies SON manipulators to each document and adds _id if necessary. """ _db = self.__database for doc in docs: # Apply user-configured SON manipulators. This order of # operations is required for backwards compatibility, # see PYTHON-709. doc = _db._apply_incoming_manipulators(doc, self) if not (isinstance(doc, RawBSONDocument) or '_id' in doc): doc['_id'] = ObjectId() doc = _db._apply_incoming_copying_manipulators(doc, self) ids.append(doc['_id']) yield doc else: def gen(): """Generator that only tracks existing _ids.""" for doc in docs: # Don't inflate RawBSONDocument by touching fields. if not isinstance(doc, RawBSONDocument): ids.append(doc.get('_id')) yield doc write_concern = write_concern or self._write_concern_for(session) blk = _Bulk(self, ordered, bypass_doc_val) blk.ops = [(message._INSERT, doc) for doc in gen()] try: blk.execute(write_concern, session=session) except BulkWriteError as bwe: _raise_last_error(bwe.details) return ids def insert_one(self, document, bypass_document_validation=False, session=None): """Insert a single document. >>> db.test.count_documents({'x': 1}) 0 >>> result = db.test.insert_one({'x': 1}) >>> result.inserted_id ObjectId('54f112defba522406c9cc208') >>> db.test.find_one({'x': 1}) {u'x': 1, u'_id': ObjectId('54f112defba522406c9cc208')} :Parameters: - `document`: The document to insert. Must be a mutable mapping type. If the document does not have an _id field one will be added automatically. - `bypass_document_validation`: (optional) If ``True``, allows the write to opt-out of document level validation. Default is ``False``. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. :Returns: - An instance of :class:`~pymongo.results.InsertOneResult`. .. seealso:: :ref:`writes-and-ids` .. note:: `bypass_document_validation` requires server version **>= 3.2** .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.2 Added bypass_document_validation support .. versionadded:: 3.0 """ common.validate_is_document_type("document", document) if not (isinstance(document, RawBSONDocument) or "_id" in document): document["_id"] = ObjectId() write_concern = self._write_concern_for(session) return InsertOneResult( self._insert(document, write_concern=write_concern, bypass_doc_val=bypass_document_validation, session=session), write_concern.acknowledged) def insert_many(self, documents, ordered=True, bypass_document_validation=False, session=None): """Insert an iterable of documents. >>> db.test.count_documents({}) 0 >>> result = db.test.insert_many([{'x': i} for i in range(2)]) >>> result.inserted_ids [ObjectId('54f113fffba522406c9cc20e'), ObjectId('54f113fffba522406c9cc20f')] >>> db.test.count_documents({}) 2 :Parameters: - `documents`: A iterable of documents to insert. - `ordered` (optional): If ``True`` (the default) documents will be inserted on the server serially, in the order provided. If an error occurs all remaining inserts are aborted. If ``False``, documents will be inserted on the server in arbitrary order, possibly in parallel, and all document inserts will be attempted. - `bypass_document_validation`: (optional) If ``True``, allows the write to opt-out of document level validation. Default is ``False``. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. :Returns: An instance of :class:`~pymongo.results.InsertManyResult`. .. seealso:: :ref:`writes-and-ids` .. note:: `bypass_document_validation` requires server version **>= 3.2** .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.2 Added bypass_document_validation support .. versionadded:: 3.0 """ if not isinstance(documents, abc.Iterable) or not documents: raise TypeError("documents must be a non-empty list") inserted_ids = [] def gen(): """A generator that validates documents and handles _ids.""" for document in documents: common.validate_is_document_type("document", document) if not isinstance(document, RawBSONDocument): if "_id" not in document: document["_id"] = ObjectId() inserted_ids.append(document["_id"]) yield (message._INSERT, document) write_concern = self._write_concern_for(session) blk = _Bulk(self, ordered, bypass_document_validation) blk.ops = [doc for doc in gen()] blk.execute(write_concern, session=session) return InsertManyResult(inserted_ids, write_concern.acknowledged) def _update(self, sock_info, criteria, document, upsert=False, check_keys=True, multi=False, manipulate=False, write_concern=None, op_id=None, ordered=True, bypass_doc_val=False, collation=None, array_filters=None, session=None, retryable_write=False): """Internal update / replace helper.""" common.validate_boolean("upsert", upsert) if manipulate: document = self.__database._fix_incoming(document, self) collation = validate_collation_or_none(collation) write_concern = write_concern or self.write_concern acknowledged = write_concern.acknowledged update_doc = SON([('q', criteria), ('u', document), ('multi', multi), ('upsert', upsert)]) if collation is not None: if sock_info.max_wire_version < 5: raise ConfigurationError( 'Must be connected to MongoDB 3.4+ to use collations.') elif not acknowledged: raise ConfigurationError( 'Collation is unsupported for unacknowledged writes.') else: update_doc['collation'] = collation if array_filters is not None: if sock_info.max_wire_version < 6: raise ConfigurationError( 'Must be connected to MongoDB 3.6+ to use array_filters.') elif not acknowledged: raise ConfigurationError( 'arrayFilters is unsupported for unacknowledged writes.') else: update_doc['arrayFilters'] = array_filters command = SON([('update', self.name), ('ordered', ordered), ('updates', [update_doc])]) if not write_concern.is_server_default: command['writeConcern'] = write_concern.document if not sock_info.op_msg_enabled and not acknowledged: # Legacy OP_UPDATE. return self._legacy_write( sock_info, 'update', command, op_id, bypass_doc_val, message.update, self.__full_name, upsert, multi, criteria, document, False, write_concern.document, check_keys, self.__write_response_codec_options) # Update command. if bypass_doc_val and sock_info.max_wire_version >= 4: command['bypassDocumentValidation'] = True # The command result has to be published for APM unmodified # so we make a shallow copy here before adding updatedExisting. result = sock_info.command( self.__database.name, command, write_concern=write_concern, codec_options=self.__write_response_codec_options, session=session, client=self.__database.client, retryable_write=retryable_write).copy() _check_write_command_response(result) # Add the updatedExisting field for compatibility. if result.get('n') and 'upserted' not in result: result['updatedExisting'] = True else: result['updatedExisting'] = False # MongoDB >= 2.6.0 returns the upsert _id in an array # element. Break it out for backward compatibility. if 'upserted' in result: result['upserted'] = result['upserted'][0]['_id'] if not acknowledged: return None return result def _update_retryable( self, criteria, document, upsert=False, check_keys=True, multi=False, manipulate=False, write_concern=None, op_id=None, ordered=True, bypass_doc_val=False, collation=None, array_filters=None, session=None): """Internal update / replace helper.""" def _update(session, sock_info, retryable_write): return self._update( sock_info, criteria, document, upsert=upsert, check_keys=check_keys, multi=multi, manipulate=manipulate, write_concern=write_concern, op_id=op_id, ordered=ordered, bypass_doc_val=bypass_doc_val, collation=collation, array_filters=array_filters, session=session, retryable_write=retryable_write) return self.__database.client._retryable_write( (write_concern or self.write_concern).acknowledged and not multi, _update, session) def replace_one(self, filter, replacement, upsert=False, bypass_document_validation=False, collation=None, session=None): """Replace a single document matching the filter. >>> for doc in db.test.find({}): ... print(doc) ... {u'x': 1, u'_id': ObjectId('54f4c5befba5220aa4d6dee7')} >>> result = db.test.replace_one({'x': 1}, {'y': 1}) >>> result.matched_count 1 >>> result.modified_count 1 >>> for doc in db.test.find({}): ... print(doc) ... {u'y': 1, u'_id': ObjectId('54f4c5befba5220aa4d6dee7')} The *upsert* option can be used to insert a new document if a matching document does not exist. >>> result = db.test.replace_one({'x': 1}, {'x': 1}, True) >>> result.matched_count 0 >>> result.modified_count 0 >>> result.upserted_id ObjectId('54f11e5c8891e756a6e1abd4') >>> db.test.find_one({'x': 1}) {u'x': 1, u'_id': ObjectId('54f11e5c8891e756a6e1abd4')} :Parameters: - `filter`: A query that matches the document to replace. - `replacement`: The new document. - `upsert` (optional): If ``True``, perform an insert if no documents match the filter. - `bypass_document_validation`: (optional) If ``True``, allows the write to opt-out of document level validation. Default is ``False``. - `collation` (optional): An instance of :class:`~pymongo.collation.Collation`. This option is only supported on MongoDB 3.4 and above. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. :Returns: - An instance of :class:`~pymongo.results.UpdateResult`. .. note:: `bypass_document_validation` requires server version **>= 3.2** .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.4 Added the `collation` option. .. versionchanged:: 3.2 Added bypass_document_validation support .. versionadded:: 3.0 """ common.validate_is_mapping("filter", filter) common.validate_ok_for_replace(replacement) write_concern = self._write_concern_for(session) return UpdateResult( self._update_retryable( filter, replacement, upsert, write_concern=write_concern, bypass_doc_val=bypass_document_validation, collation=collation, session=session), write_concern.acknowledged) def update_one(self, filter, update, upsert=False, bypass_document_validation=False, collation=None, array_filters=None, session=None): """Update a single document matching the filter. >>> for doc in db.test.find(): ... print(doc) ... {u'x': 1, u'_id': 0} {u'x': 1, u'_id': 1} {u'x': 1, u'_id': 2} >>> result = db.test.update_one({'x': 1}, {'$inc': {'x': 3}}) >>> result.matched_count 1 >>> result.modified_count 1 >>> for doc in db.test.find(): ... print(doc) ... {u'x': 4, u'_id': 0} {u'x': 1, u'_id': 1} {u'x': 1, u'_id': 2} :Parameters: - `filter`: A query that matches the document to update. - `update`: The modifications to apply. - `upsert` (optional): If ``True``, perform an insert if no documents match the filter. - `bypass_document_validation`: (optional) If ``True``, allows the write to opt-out of document level validation. Default is ``False``. - `collation` (optional): An instance of :class:`~pymongo.collation.Collation`. This option is only supported on MongoDB 3.4 and above. - `array_filters` (optional): A list of filters specifying which array elements an update should apply. Requires MongoDB 3.6+. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. :Returns: - An instance of :class:`~pymongo.results.UpdateResult`. .. note:: `bypass_document_validation` requires server version **>= 3.2** .. versionchanged:: 3.6 Added the `array_filters` and ``session`` parameters. .. versionchanged:: 3.4 Added the `collation` option. .. versionchanged:: 3.2 Added bypass_document_validation support .. versionadded:: 3.0 """ common.validate_is_mapping("filter", filter) common.validate_ok_for_update(update) common.validate_list_or_none('array_filters', array_filters) write_concern = self._write_concern_for(session) return UpdateResult( self._update_retryable( filter, update, upsert, check_keys=False, write_concern=write_concern, bypass_doc_val=bypass_document_validation, collation=collation, array_filters=array_filters, session=session), write_concern.acknowledged) def update_many(self, filter, update, upsert=False, array_filters=None, bypass_document_validation=False, collation=None, session=None): """Update one or more documents that match the filter. >>> for doc in db.test.find(): ... print(doc) ... {u'x': 1, u'_id': 0} {u'x': 1, u'_id': 1} {u'x': 1, u'_id': 2} >>> result = db.test.update_many({'x': 1}, {'$inc': {'x': 3}}) >>> result.matched_count 3 >>> result.modified_count 3 >>> for doc in db.test.find(): ... print(doc) ... {u'x': 4, u'_id': 0} {u'x': 4, u'_id': 1} {u'x': 4, u'_id': 2} :Parameters: - `filter`: A query that matches the documents to update. - `update`: The modifications to apply. - `upsert` (optional): If ``True``, perform an insert if no documents match the filter. - `bypass_document_validation` (optional): If ``True``, allows the write to opt-out of document level validation. Default is ``False``. - `collation` (optional): An instance of :class:`~pymongo.collation.Collation`. This option is only supported on MongoDB 3.4 and above. - `array_filters` (optional): A list of filters specifying which array elements an update should apply. Requires MongoDB 3.6+. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. :Returns: - An instance of :class:`~pymongo.results.UpdateResult`. .. note:: `bypass_document_validation` requires server version **>= 3.2** .. versionchanged:: 3.6 Added ``array_filters`` and ``session`` parameters. .. versionchanged:: 3.4 Added the `collation` option. .. versionchanged:: 3.2 Added bypass_document_validation support .. versionadded:: 3.0 """ common.validate_is_mapping("filter", filter) common.validate_ok_for_update(update) common.validate_list_or_none('array_filters', array_filters) write_concern = self._write_concern_for(session) return UpdateResult( self._update_retryable( filter, update, upsert, check_keys=False, multi=True, write_concern=write_concern, bypass_doc_val=bypass_document_validation, collation=collation, array_filters=array_filters, session=session), write_concern.acknowledged) def drop(self, session=None): """Alias for :meth:`~pymongo.database.Database.drop_collection`. :Parameters: - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. The following two calls are equivalent: >>> db.foo.drop() >>> db.drop_collection("foo") .. versionchanged:: 3.7 :meth:`drop` now respects this :class:`Collection`'s :attr:`write_concern`. .. versionchanged:: 3.6 Added ``session`` parameter. """ dbo = self.__database.client.get_database( self.__database.name, self.codec_options, self.read_preference, self.write_concern, self.read_concern) dbo.drop_collection(self.__name, session=session) def _delete( self, sock_info, criteria, multi, write_concern=None, op_id=None, ordered=True, collation=None, session=None, retryable_write=False): """Internal delete helper.""" common.validate_is_mapping("filter", criteria) write_concern = write_concern or self.write_concern acknowledged = write_concern.acknowledged delete_doc = SON([('q', criteria), ('limit', int(not multi))]) collation = validate_collation_or_none(collation) if collation is not None: if sock_info.max_wire_version < 5: raise ConfigurationError( 'Must be connected to MongoDB 3.4+ to use collations.') elif not acknowledged: raise ConfigurationError( 'Collation is unsupported for unacknowledged writes.') else: delete_doc['collation'] = collation command = SON([('delete', self.name), ('ordered', ordered), ('deletes', [delete_doc])]) if not write_concern.is_server_default: command['writeConcern'] = write_concern.document if not sock_info.op_msg_enabled and not acknowledged: # Legacy OP_DELETE. return self._legacy_write( sock_info, 'delete', command, op_id, False, message.delete, self.__full_name, criteria, False, write_concern.document, self.__write_response_codec_options, int(not multi)) # Delete command. result = sock_info.command( self.__database.name, command, write_concern=write_concern, codec_options=self.__write_response_codec_options, session=session, client=self.__database.client, retryable_write=retryable_write) _check_write_command_response(result) return result def _delete_retryable( self, criteria, multi, write_concern=None, op_id=None, ordered=True, collation=None, session=None): """Internal delete helper.""" def _delete(session, sock_info, retryable_write): return self._delete( sock_info, criteria, multi, write_concern=write_concern, op_id=op_id, ordered=ordered, collation=collation, session=session, retryable_write=retryable_write) return self.__database.client._retryable_write( (write_concern or self.write_concern).acknowledged and not multi, _delete, session) def delete_one(self, filter, collation=None, session=None): """Delete a single document matching the filter. >>> db.test.count_documents({'x': 1}) 3 >>> result = db.test.delete_one({'x': 1}) >>> result.deleted_count 1 >>> db.test.count_documents({'x': 1}) 2 :Parameters: - `filter`: A query that matches the document to delete. - `collation` (optional): An instance of :class:`~pymongo.collation.Collation`. This option is only supported on MongoDB 3.4 and above. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. :Returns: - An instance of :class:`~pymongo.results.DeleteResult`. .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.4 Added the `collation` option. .. versionadded:: 3.0 """ write_concern = self._write_concern_for(session) return DeleteResult( self._delete_retryable( filter, False, write_concern=write_concern, collation=collation, session=session), write_concern.acknowledged) def delete_many(self, filter, collation=None, session=None): """Delete one or more documents matching the filter. >>> db.test.count_documents({'x': 1}) 3 >>> result = db.test.delete_many({'x': 1}) >>> result.deleted_count 3 >>> db.test.count_documents({'x': 1}) 0 :Parameters: - `filter`: A query that matches the documents to delete. - `collation` (optional): An instance of :class:`~pymongo.collation.Collation`. This option is only supported on MongoDB 3.4 and above. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. :Returns: - An instance of :class:`~pymongo.results.DeleteResult`. .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.4 Added the `collation` option. .. versionadded:: 3.0 """ write_concern = self._write_concern_for(session) return DeleteResult( self._delete_retryable( filter, True, write_concern=write_concern, collation=collation, session=session), write_concern.acknowledged) def find_one(self, filter=None, *args, **kwargs): """Get a single document from the database. All arguments to :meth:`find` are also valid arguments for :meth:`find_one`, although any `limit` argument will be ignored. Returns a single document, or ``None`` if no matching document is found. The :meth:`find_one` method obeys the :attr:`read_preference` of this :class:`Collection`. :Parameters: - `filter` (optional): a dictionary specifying the query to be performed OR any other type to be used as the value for a query for ``"_id"``. - `*args` (optional): any additional positional arguments are the same as the arguments to :meth:`find`. - `**kwargs` (optional): any additional keyword arguments are the same as the arguments to :meth:`find`. >>> collection.find_one(max_time_ms=100) """ if (filter is not None and not isinstance(filter, abc.Mapping)): filter = {"_id": filter} cursor = self.find(filter, *args, **kwargs) for result in cursor.limit(-1): return result return None def find(self, *args, **kwargs): """Query the database. The `filter` argument is a prototype document that all results must match. For example: >>> db.test.find({"hello": "world"}) only matches documents that have a key "hello" with value "world". Matches can have other keys *in addition* to "hello". The `projection` argument is used to specify a subset of fields that should be included in the result documents. By limiting results to a certain subset of fields you can cut down on network traffic and decoding time. Raises :class:`TypeError` if any of the arguments are of improper type. Returns an instance of :class:`~pymongo.cursor.Cursor` corresponding to this query. The :meth:`find` method obeys the :attr:`read_preference` of this :class:`Collection`. :Parameters: - `filter` (optional): a SON object specifying elements which must be present for a document to be included in the result set - `projection` (optional): a list of field names that should be returned in the result set or a dict specifying the fields to include or exclude. If `projection` is a list "_id" will always be returned. Use a dict to exclude fields from the result (e.g. projection={'_id': False}). - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `skip` (optional): the number of documents to omit (from the start of the result set) when returning the results - `limit` (optional): the maximum number of results to return - `no_cursor_timeout` (optional): if False (the default), any returned cursor is closed by the server after 10 minutes of inactivity. If set to True, the returned cursor will never time out on the server. Care should be taken to ensure that cursors with no_cursor_timeout turned on are properly closed. - `cursor_type` (optional): the type of cursor to return. The valid options are defined by :class:`~pymongo.cursor.CursorType`: - :attr:`~pymongo.cursor.CursorType.NON_TAILABLE` - the result of this find call will return a standard cursor over the result set. - :attr:`~pymongo.cursor.CursorType.TAILABLE` - the result of this find call will be a tailable cursor - tailable cursors are only for use with capped collections. They are not closed when the last data is retrieved but are kept open and the cursor location marks the final document position. If more data is received iteration of the cursor will continue from the last document received. For details, see the `tailable cursor documentation `_. - :attr:`~pymongo.cursor.CursorType.TAILABLE_AWAIT` - the result of this find call will be a tailable cursor with the await flag set. The server will wait for a few seconds after returning the full result set so that it can capture and return additional data added during the query. - :attr:`~pymongo.cursor.CursorType.EXHAUST` - the result of this find call will be an exhaust cursor. MongoDB will stream batched results to the client without waiting for the client to request each batch, reducing latency. See notes on compatibility below. - `sort` (optional): a list of (key, direction) pairs specifying the sort order for this query. See :meth:`~pymongo.cursor.Cursor.sort` for details. - `allow_partial_results` (optional): if True, mongos will return partial results if some shards are down instead of returning an error. - `oplog_replay` (optional): If True, set the oplogReplay query flag. - `batch_size` (optional): Limits the number of documents returned in a single batch. - `manipulate` (optional): **DEPRECATED** - If True (the default), apply any outgoing SON manipulators before returning. - `collation` (optional): An instance of :class:`~pymongo.collation.Collation`. This option is only supported on MongoDB 3.4 and above. - `return_key` (optional): If True, return only the index keys in each document. - `show_record_id` (optional): If True, adds a field ``$recordId`` in each document with the storage engine's internal record identifier. - `snapshot` (optional): **DEPRECATED** - If True, prevents the cursor from returning a document more than once because of an intervening write operation. - `hint` (optional): An index, in the same format as passed to :meth:`~pymongo.collection.Collection.create_index` (e.g. ``[('field', ASCENDING)]``). Pass this as an alternative to calling :meth:`~pymongo.cursor.Cursor.hint` on the cursor to tell Mongo the proper index to use for the query. - `max_time_ms` (optional): Specifies a time limit for a query operation. If the specified time is exceeded, the operation will be aborted and :exc:`~pymongo.errors.ExecutionTimeout` is raised. Pass this as an alternative to calling :meth:`~pymongo.cursor.Cursor.max_time_ms` on the cursor. - `max_scan` (optional): **DEPRECATED** - The maximum number of documents to scan. Pass this as an alternative to calling :meth:`~pymongo.cursor.Cursor.max_scan` on the cursor. - `min` (optional): A list of field, limit pairs specifying the inclusive lower bound for all keys of a specific index in order. Pass this as an alternative to calling :meth:`~pymongo.cursor.Cursor.min` on the cursor. - `max` (optional): A list of field, limit pairs specifying the exclusive upper bound for all keys of a specific index in order. Pass this as an alternative to calling :meth:`~pymongo.cursor.Cursor.max` on the cursor. - `comment` (optional): A string or document. Pass this as an alternative to calling :meth:`~pymongo.cursor.Cursor.comment` on the cursor. - `modifiers` (optional): **DEPRECATED** - A dict specifying additional MongoDB query modifiers. Use the keyword arguments listed above instead. .. note:: There are a number of caveats to using :attr:`~pymongo.cursor.CursorType.EXHAUST` as cursor_type: - The `limit` option can not be used with an exhaust cursor. - Exhaust cursors are not supported by mongos and can not be used with a sharded cluster. - A :class:`~pymongo.cursor.Cursor` instance created with the :attr:`~pymongo.cursor.CursorType.EXHAUST` cursor_type requires an exclusive :class:`~socket.socket` connection to MongoDB. If the :class:`~pymongo.cursor.Cursor` is discarded without being completely iterated the underlying :class:`~socket.socket` connection will be closed and discarded without being returned to the connection pool. .. versionchanged:: 3.7 Deprecated the `snapshot` option, which is deprecated in MongoDB 3.6 and removed in MongoDB 4.0. Deprecated the `max_scan` option. Support for this option is deprecated in MongoDB 4.0. Use `max_time_ms` instead to limit server side execution time. .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.5 Added the options `return_key`, `show_record_id`, `snapshot`, `hint`, `max_time_ms`, `max_scan`, `min`, `max`, and `comment`. Deprecated the option `modifiers`. .. versionchanged:: 3.4 Support the `collation` option. .. versionchanged:: 3.0 Changed the parameter names `spec`, `fields`, `timeout`, and `partial` to `filter`, `projection`, `no_cursor_timeout`, and `allow_partial_results` respectively. Added the `cursor_type`, `oplog_replay`, and `modifiers` options. Removed the `network_timeout`, `read_preference`, `tag_sets`, `secondary_acceptable_latency_ms`, `max_scan`, `snapshot`, `tailable`, `await_data`, `exhaust`, `as_class`, and slave_okay parameters. Removed `compile_re` option: PyMongo now always represents BSON regular expressions as :class:`~bson.regex.Regex` objects. Use :meth:`~bson.regex.Regex.try_compile` to attempt to convert from a BSON regular expression to a Python regular expression object. Soft deprecated the `manipulate` option. .. versionchanged:: 2.7 Added `compile_re` option. If set to False, PyMongo represented BSON regular expressions as :class:`~bson.regex.Regex` objects instead of attempting to compile BSON regular expressions as Python native regular expressions, thus preventing errors for some incompatible patterns, see `PYTHON-500`_. .. versionadded:: 2.3 The `tag_sets` and `secondary_acceptable_latency_ms` parameters. .. _PYTHON-500: https://jira.mongodb.org/browse/PYTHON-500 .. mongodoc:: find """ return Cursor(self, *args, **kwargs) def find_raw_batches(self, *args, **kwargs): """Query the database and retrieve batches of raw BSON. Similar to the :meth:`find` method but returns a :class:`~pymongo.cursor.RawBatchCursor`. This example demonstrates how to work with raw batches, but in practice raw batches should be passed to an external library that can decode BSON into another data type, rather than used with PyMongo's :mod:`bson` module. >>> import bson >>> cursor = db.test.find_raw_batches() >>> for batch in cursor: ... print(bson.decode_all(batch)) .. note:: find_raw_batches does not support sessions. .. versionadded:: 3.6 """ # OP_MSG with document stream returns is required to support # sessions. if "session" in kwargs: raise ConfigurationError( "find_raw_batches does not support sessions") return RawBatchCursor(self, *args, **kwargs) def parallel_scan(self, num_cursors, session=None, **kwargs): """**DEPRECATED**: Scan this entire collection in parallel. Returns a list of up to ``num_cursors`` cursors that can be iterated concurrently. As long as the collection is not modified during scanning, each document appears once in one of the cursors result sets. For example, to process each document in a collection using some thread-safe ``process_document()`` function: >>> def process_cursor(cursor): ... for document in cursor: ... # Some thread-safe processing function: ... process_document(document) >>> >>> # Get up to 4 cursors. ... >>> cursors = collection.parallel_scan(4) >>> threads = [ ... threading.Thread(target=process_cursor, args=(cursor,)) ... for cursor in cursors] >>> >>> for thread in threads: ... thread.start() >>> >>> for thread in threads: ... thread.join() >>> >>> # All documents have now been processed. The :meth:`parallel_scan` method obeys the :attr:`read_preference` of this :class:`Collection`. :Parameters: - `num_cursors`: the number of cursors to return - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs`: additional options for the parallelCollectionScan command can be passed as keyword arguments. .. note:: Requires server version **>= 2.5.5**. .. versionchanged:: 3.7 Deprecated. .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.4 Added back support for arbitrary keyword arguments. MongoDB 3.4 adds support for maxTimeMS as an option to the parallelCollectionScan command. .. versionchanged:: 3.0 Removed support for arbitrary keyword arguments, since the parallelCollectionScan command has no optional arguments. """ warnings.warn("parallel_scan is deprecated. MongoDB 4.2 will remove " "the parallelCollectionScan command.", DeprecationWarning, stacklevel=2) cmd = SON([('parallelCollectionScan', self.__name), ('numCursors', num_cursors)]) cmd.update(kwargs) with self._socket_for_reads(session) as (sock_info, slave_ok): # We call sock_info.command here directly, instead of # calling self._command to avoid using an implicit session. result = sock_info.command( self.__database.name, cmd, slave_ok, self._read_preference_for(session), self.codec_options, read_concern=self.read_concern, parse_write_concern_error=True, session=session, client=self.__database.client) cursors = [] for cursor in result['cursors']: cursors.append(CommandCursor( self, cursor['cursor'], sock_info.address, session=session, explicit_session=session is not None)) return cursors def _count(self, cmd, collation=None, session=None): """Internal count helper.""" with self._socket_for_reads(session) as (sock_info, slave_ok): res = self._command( sock_info, cmd, slave_ok, allowable_errors=["ns missing"], codec_options=self.__write_response_codec_options, read_concern=self.read_concern, collation=collation, session=session) if res.get("errmsg", "") == "ns missing": return 0 return int(res["n"]) def _aggregate_one_result( self, sock_info, slave_ok, cmd, collation=None, session=None): """Internal helper to run an aggregate that returns a single result.""" result = self._command( sock_info, cmd, slave_ok, codec_options=self.__write_response_codec_options, read_concern=self.read_concern, collation=collation, session=session) batch = result['cursor']['firstBatch'] return batch[0] if batch else None def estimated_document_count(self, **kwargs): """Get an estimate of the number of documents in this collection using collection metadata. The :meth:`estimated_document_count` method is **not** supported in a transaction. All optional parameters should be passed as keyword arguments to this method. Valid options include: - `maxTimeMS` (int): The maximum amount of time to allow this operation to run, in milliseconds. :Parameters: - `**kwargs` (optional): See list of options above. .. versionadded:: 3.7 """ if 'session' in kwargs: raise ConfigurationError( 'estimated_document_count does not support sessions') cmd = SON([('count', self.__name)]) cmd.update(kwargs) return self._count(cmd) def count_documents(self, filter, session=None, **kwargs): """Count the number of documents in this collection. The :meth:`count_documents` method is supported in a transaction. All optional parameters should be passed as keyword arguments to this method. Valid options include: - `skip` (int): The number of matching documents to skip before returning results. - `limit` (int): The maximum number of documents to count. - `maxTimeMS` (int): The maximum amount of time to allow this operation to run, in milliseconds. - `collation` (optional): An instance of :class:`~pymongo.collation.Collation`. This option is only supported on MongoDB 3.4 and above. - `hint` (string or list of tuples): The index to use. Specify either the index name as a string or the index specification as a list of tuples (e.g. [('a', pymongo.ASCENDING), ('b', pymongo.ASCENDING)]). This option is only supported on MongoDB 3.6 and above. The :meth:`count_documents` method obeys the :attr:`read_preference` of this :class:`Collection`. .. note:: When migrating from :meth:`count` to :meth:`count_documents` the following query operators must be replaced: +-------------+-------------------------------------+ | Operator | Replacement | +=============+=====================================+ | $where | `$expr`_ | +-------------+-------------------------------------+ | $near | `$geoWithin`_ with `$center`_ | +-------------+-------------------------------------+ | $nearSphere | `$geoWithin`_ with `$centerSphere`_ | +-------------+-------------------------------------+ $expr requires MongoDB 3.6+ :Parameters: - `filter` (required): A query document that selects which documents to count in the collection. Can be an empty document to count all documents. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs` (optional): See list of options above. .. versionadded:: 3.7 .. _$expr: https://docs.mongodb.com/manual/reference/operator/query/expr/ .. _$geoWithin: https://docs.mongodb.com/manual/reference/operator/query/geoWithin/ .. _$center: https://docs.mongodb.com/manual/reference/operator/query/center/#op._S_center .. _$centerSphere: https://docs.mongodb.com/manual/reference/operator/query/centerSphere/#op._S_centerSphere """ pipeline = [{'$match': filter}] if 'skip' in kwargs: pipeline.append({'$skip': kwargs.pop('skip')}) if 'limit' in kwargs: pipeline.append({'$limit': kwargs.pop('limit')}) pipeline.append({'$group': {'_id': None, 'n': {'$sum': 1}}}) cmd = SON([('aggregate', self.__name), ('pipeline', pipeline), ('cursor', {})]) if "hint" in kwargs and not isinstance(kwargs["hint"], string_type): kwargs["hint"] = helpers._index_document(kwargs["hint"]) collation = validate_collation_or_none(kwargs.pop('collation', None)) cmd.update(kwargs) with self._socket_for_reads(session) as (sock_info, slave_ok): result = self._aggregate_one_result( sock_info, slave_ok, cmd, collation, session) if not result: return 0 return result['n'] def count(self, filter=None, session=None, **kwargs): """**DEPRECATED** - Get the number of documents in this collection. The :meth:`count` method is deprecated and **not** supported in a transaction. Please use :meth:`count_documents` or :meth:`estimated_document_count` instead. All optional count parameters should be passed as keyword arguments to this method. Valid options include: - `skip` (int): The number of matching documents to skip before returning results. - `limit` (int): The maximum number of documents to count. - `maxTimeMS` (int): The maximum amount of time to allow the count command to run, in milliseconds. - `collation` (optional): An instance of :class:`~pymongo.collation.Collation`. This option is only supported on MongoDB 3.4 and above. - `hint` (string or list of tuples): The index to use. Specify either the index name as a string or the index specification as a list of tuples (e.g. [('a', pymongo.ASCENDING), ('b', pymongo.ASCENDING)]). The :meth:`count` method obeys the :attr:`read_preference` of this :class:`Collection`. .. note:: When migrating from :meth:`count` to :meth:`count_documents` the following query operators must be replaced: +-------------+-------------------------------------+ | Operator | Replacement | +=============+=====================================+ | $where | `$expr`_ | +-------------+-------------------------------------+ | $near | `$geoWithin`_ with `$center`_ | +-------------+-------------------------------------+ | $nearSphere | `$geoWithin`_ with `$centerSphere`_ | +-------------+-------------------------------------+ $expr requires MongoDB 3.6+ :Parameters: - `filter` (optional): A query document that selects which documents to count in the collection. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs` (optional): See list of options above. .. versionchanged:: 3.7 Deprecated. .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.4 Support the `collation` option. .. _$expr: https://docs.mongodb.com/manual/reference/operator/query/expr/ .. _$geoWithin: https://docs.mongodb.com/manual/reference/operator/query/geoWithin/ .. _$center: https://docs.mongodb.com/manual/reference/operator/query/center/#op._S_center .. _$centerSphere: https://docs.mongodb.com/manual/reference/operator/query/centerSphere/#op._S_centerSphere """ warnings.warn("count is deprecated. Use estimated_document_count or " "count_documents instead. Please note that $where must " "be replaced by $expr, $near must be replaced by " "$geoWithin with $center, and $nearSphere must be " "replaced by $geoWithin with $centerSphere", DeprecationWarning, stacklevel=2) cmd = SON([("count", self.__name)]) if filter is not None: if "query" in kwargs: raise ConfigurationError("can't pass both filter and query") kwargs["query"] = filter if "hint" in kwargs and not isinstance(kwargs["hint"], string_type): kwargs["hint"] = helpers._index_document(kwargs["hint"]) collation = validate_collation_or_none(kwargs.pop('collation', None)) cmd.update(kwargs) return self._count(cmd, collation, session) def create_indexes(self, indexes, session=None, **kwargs): """Create one or more indexes on this collection. >>> from pymongo import IndexModel, ASCENDING, DESCENDING >>> index1 = IndexModel([("hello", DESCENDING), ... ("world", ASCENDING)], name="hello_world") >>> index2 = IndexModel([("goodbye", DESCENDING)]) >>> db.test.create_indexes([index1, index2]) ["hello_world", "goodbye_-1"] :Parameters: - `indexes`: A list of :class:`~pymongo.operations.IndexModel` instances. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs` (optional): optional arguments to the createIndexes command (like maxTimeMS) can be passed as keyword arguments. .. note:: `create_indexes` uses the `createIndexes`_ command introduced in MongoDB **2.6** and cannot be used with earlier versions. .. note:: The :attr:`~pymongo.collection.Collection.write_concern` of this collection is automatically applied to this operation when using MongoDB >= 3.4. .. versionchanged:: 3.6 Added ``session`` parameter. Added support for arbitrary keyword arguments. .. versionchanged:: 3.4 Apply this collection's write concern automatically to this operation when connected to MongoDB >= 3.4. .. versionadded:: 3.0 .. _createIndexes: https://docs.mongodb.com/manual/reference/command/createIndexes/ """ common.validate_list('indexes', indexes) names = [] with self._socket_for_writes() as sock_info: supports_collations = sock_info.max_wire_version >= 5 def gen_indexes(): for index in indexes: if not isinstance(index, IndexModel): raise TypeError( "%r is not an instance of " "pymongo.operations.IndexModel" % (index,)) document = index.document if "collation" in document and not supports_collations: raise ConfigurationError( "Must be connected to MongoDB " "3.4+ to use collations.") names.append(document["name"]) yield document cmd = SON([('createIndexes', self.name), ('indexes', list(gen_indexes()))]) cmd.update(kwargs) self._command( sock_info, cmd, read_preference=ReadPreference.PRIMARY, codec_options=_UNICODE_REPLACE_CODEC_OPTIONS, write_concern=self._write_concern_for(session), session=session) return names def __create_index(self, keys, index_options, session, **kwargs): """Internal create index helper. :Parameters: - `keys`: a list of tuples [(key, type), (key, type), ...] - `index_options`: a dict of index options. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. """ index_doc = helpers._index_document(keys) index = {"key": index_doc} collation = validate_collation_or_none( index_options.pop('collation', None)) index.update(index_options) with self._socket_for_writes() as sock_info: if collation is not None: if sock_info.max_wire_version < 5: raise ConfigurationError( 'Must be connected to MongoDB 3.4+ to use collations.') else: index['collation'] = collation cmd = SON([('createIndexes', self.name), ('indexes', [index])]) cmd.update(kwargs) self._command( sock_info, cmd, read_preference=ReadPreference.PRIMARY, codec_options=_UNICODE_REPLACE_CODEC_OPTIONS, write_concern=self._write_concern_for(session), session=session) def create_index(self, keys, session=None, **kwargs): """Creates an index on this collection. Takes either a single key or a list of (key, direction) pairs. The key(s) must be an instance of :class:`basestring` (:class:`str` in python 3), and the direction(s) must be one of (:data:`~pymongo.ASCENDING`, :data:`~pymongo.DESCENDING`, :data:`~pymongo.GEO2D`, :data:`~pymongo.GEOHAYSTACK`, :data:`~pymongo.GEOSPHERE`, :data:`~pymongo.HASHED`, :data:`~pymongo.TEXT`). To create a single key ascending index on the key ``'mike'`` we just use a string argument:: >>> my_collection.create_index("mike") For a compound index on ``'mike'`` descending and ``'eliot'`` ascending we need to use a list of tuples:: >>> my_collection.create_index([("mike", pymongo.DESCENDING), ... ("eliot", pymongo.ASCENDING)]) All optional index creation parameters should be passed as keyword arguments to this method. For example:: >>> my_collection.create_index([("mike", pymongo.DESCENDING)], ... background=True) Valid options include, but are not limited to: - `name`: custom name to use for this index - if none is given, a name will be generated. - `unique`: if ``True`` creates a uniqueness constraint on the index. - `background`: if ``True`` this index should be created in the background. - `sparse`: if ``True``, omit from the index any documents that lack the indexed field. - `bucketSize`: for use with geoHaystack indexes. Number of documents to group together within a certain proximity to a given longitude and latitude. - `min`: minimum value for keys in a :data:`~pymongo.GEO2D` index. - `max`: maximum value for keys in a :data:`~pymongo.GEO2D` index. - `expireAfterSeconds`: Used to create an expiring (TTL) collection. MongoDB will automatically delete documents from this collection after seconds. The indexed field must be a UTC datetime or the data will not expire. - `partialFilterExpression`: A document that specifies a filter for a partial index. - `collation` (optional): An instance of :class:`~pymongo.collation.Collation`. This option is only supported on MongoDB 3.4 and above. See the MongoDB documentation for a full list of supported options by server version. .. warning:: `dropDups` is not supported by MongoDB 3.0 or newer. The option is silently ignored by the server and unique index builds using the option will fail if a duplicate value is detected. .. note:: `partialFilterExpression` requires server version **>= 3.2** .. note:: The :attr:`~pymongo.collection.Collection.write_concern` of this collection is automatically applied to this operation when using MongoDB >= 3.4. :Parameters: - `keys`: a single key or a list of (key, direction) pairs specifying the index to create - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs` (optional): any additional index creation options (see the above list) should be passed as keyword arguments .. versionchanged:: 3.6 Added ``session`` parameter. Added support for passing maxTimeMS in kwargs. .. versionchanged:: 3.4 Apply this collection's write concern automatically to this operation when connected to MongoDB >= 3.4. Support the `collation` option. .. versionchanged:: 3.2 Added partialFilterExpression to support partial indexes. .. versionchanged:: 3.0 Renamed `key_or_list` to `keys`. Removed the `cache_for` option. :meth:`create_index` no longer caches index names. Removed support for the drop_dups and bucket_size aliases. .. mongodoc:: indexes """ keys = helpers._index_list(keys) name = kwargs.setdefault("name", helpers._gen_index_name(keys)) cmd_options = {} if "maxTimeMS" in kwargs: cmd_options["maxTimeMS"] = kwargs.pop("maxTimeMS") self.__create_index(keys, kwargs, session, **cmd_options) return name def ensure_index(self, key_or_list, cache_for=300, **kwargs): """**DEPRECATED** - Ensures that an index exists on this collection. .. versionchanged:: 3.0 **DEPRECATED** """ warnings.warn("ensure_index is deprecated. Use create_index instead.", DeprecationWarning, stacklevel=2) # The types supported by datetime.timedelta. if not (isinstance(cache_for, integer_types) or isinstance(cache_for, float)): raise TypeError("cache_for must be an integer or float.") if "drop_dups" in kwargs: kwargs["dropDups"] = kwargs.pop("drop_dups") if "bucket_size" in kwargs: kwargs["bucketSize"] = kwargs.pop("bucket_size") keys = helpers._index_list(key_or_list) name = kwargs.setdefault("name", helpers._gen_index_name(keys)) # Note that there is a race condition here. One thread could # check if the index is cached and be preempted before creating # and caching the index. This means multiple threads attempting # to create the same index concurrently could send the index # to the server two or more times. This has no practical impact # other than wasted round trips. if not self.__database.client._cached(self.__database.name, self.__name, name): self.__create_index(keys, kwargs, session=None) self.__database.client._cache_index(self.__database.name, self.__name, name, cache_for) return name return None def drop_indexes(self, session=None, **kwargs): """Drops all indexes on this collection. Can be used on non-existant collections or collections with no indexes. Raises OperationFailure on an error. :Parameters: - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs` (optional): optional arguments to the createIndexes command (like maxTimeMS) can be passed as keyword arguments. .. note:: The :attr:`~pymongo.collection.Collection.write_concern` of this collection is automatically applied to this operation when using MongoDB >= 3.4. .. versionchanged:: 3.6 Added ``session`` parameter. Added support for arbitrary keyword arguments. .. versionchanged:: 3.4 Apply this collection's write concern automatically to this operation when connected to MongoDB >= 3.4. """ self.__database.client._purge_index(self.__database.name, self.__name) self.drop_index("*", session=session, **kwargs) def drop_index(self, index_or_name, session=None, **kwargs): """Drops the specified index on this collection. Can be used on non-existant collections or collections with no indexes. Raises OperationFailure on an error (e.g. trying to drop an index that does not exist). `index_or_name` can be either an index name (as returned by `create_index`), or an index specifier (as passed to `create_index`). An index specifier should be a list of (key, direction) pairs. Raises TypeError if index is not an instance of (str, unicode, list). .. warning:: if a custom name was used on index creation (by passing the `name` parameter to :meth:`create_index` or :meth:`ensure_index`) the index **must** be dropped by name. :Parameters: - `index_or_name`: index (or name of index) to drop - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs` (optional): optional arguments to the createIndexes command (like maxTimeMS) can be passed as keyword arguments. .. note:: The :attr:`~pymongo.collection.Collection.write_concern` of this collection is automatically applied to this operation when using MongoDB >= 3.4. .. versionchanged:: 3.6 Added ``session`` parameter. Added support for arbitrary keyword arguments. .. versionchanged:: 3.4 Apply this collection's write concern automatically to this operation when connected to MongoDB >= 3.4. """ name = index_or_name if isinstance(index_or_name, list): name = helpers._gen_index_name(index_or_name) if not isinstance(name, string_type): raise TypeError("index_or_name must be an index name or list") self.__database.client._purge_index( self.__database.name, self.__name, name) cmd = SON([("dropIndexes", self.__name), ("index", name)]) cmd.update(kwargs) with self._socket_for_writes() as sock_info: self._command(sock_info, cmd, read_preference=ReadPreference.PRIMARY, allowable_errors=["ns not found"], write_concern=self._write_concern_for(session), session=session) def reindex(self, session=None, **kwargs): """Rebuilds all indexes on this collection. :Parameters: - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs` (optional): optional arguments to the reIndex command (like maxTimeMS) can be passed as keyword arguments. .. warning:: reindex blocks all other operations (indexes are built in the foreground) and will be slow for large collections. .. versionchanged:: 3.6 Added ``session`` parameter. Added support for arbitrary keyword arguments. .. versionchanged:: 3.4 Apply this collection's write concern automatically to this operation when connected to MongoDB >= 3.4. .. versionchanged:: 3.5 We no longer apply this collection's write concern to this operation. MongoDB 3.4 silently ignored the write concern. MongoDB 3.6+ returns an error if we include the write concern. """ cmd = SON([("reIndex", self.__name)]) cmd.update(kwargs) with self._socket_for_writes() as sock_info: return self._command( sock_info, cmd, read_preference=ReadPreference.PRIMARY, session=session) def list_indexes(self, session=None): """Get a cursor over the index documents for this collection. >>> for index in db.test.list_indexes(): ... print(index) ... SON([(u'v', 1), (u'key', SON([(u'_id', 1)])), (u'name', u'_id_'), (u'ns', u'test.test')]) :Parameters: - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. :Returns: An instance of :class:`~pymongo.command_cursor.CommandCursor`. .. versionchanged:: 3.6 Added ``session`` parameter. .. versionadded:: 3.0 """ codec_options = CodecOptions(SON) coll = self.with_options(codec_options=codec_options, read_preference=ReadPreference.PRIMARY) sock_ctx, read_pref = self._socket_for_primary_reads(session) with sock_ctx as (sock_info, slave_ok): cmd = SON([("listIndexes", self.__name), ("cursor", {})]) if sock_info.max_wire_version > 2: with self.__database.client._tmp_session(session, False) as s: try: cursor = self._command(sock_info, cmd, slave_ok, read_pref, codec_options, session=s)["cursor"] except OperationFailure as exc: # Ignore NamespaceNotFound errors to match the behavior # of reading from *.system.indexes. if exc.code != 26: raise cursor = {'id': 0, 'firstBatch': []} return CommandCursor(coll, cursor, sock_info.address, session=s, explicit_session=session is not None) else: res = message._first_batch( sock_info, self.__database.name, "system.indexes", {"ns": self.__full_name}, 0, slave_ok, codec_options, read_pref, cmd, self.database.client._event_listeners) cursor = res["cursor"] # Note that a collection can only have 64 indexes, so there # will never be a getMore call. return CommandCursor(coll, cursor, sock_info.address) def index_information(self, session=None): """Get information on this collection's indexes. Returns a dictionary where the keys are index names (as returned by create_index()) and the values are dictionaries containing information about each index. The dictionary is guaranteed to contain at least a single key, ``"key"`` which is a list of (key, direction) pairs specifying the index (as passed to create_index()). It will also contain any other metadata about the indexes, except for the ``"ns"`` and ``"name"`` keys, which are cleaned. Example output might look like this: >>> db.test.create_index("x", unique=True) u'x_1' >>> db.test.index_information() {u'_id_': {u'key': [(u'_id', 1)]}, u'x_1': {u'unique': True, u'key': [(u'x', 1)]}} :Parameters: - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. .. versionchanged:: 3.6 Added ``session`` parameter. """ cursor = self.list_indexes(session=session) info = {} for index in cursor: index["key"] = index["key"].items() index = dict(index) info[index.pop("name")] = index return info def options(self, session=None): """Get the options set on this collection. Returns a dictionary of options and their values - see :meth:`~pymongo.database.Database.create_collection` for more information on the possible options. Returns an empty dictionary if the collection has not been created yet. :Parameters: - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. .. versionchanged:: 3.6 Added ``session`` parameter. """ dbo = self.__database.client.get_database( self.__database.name, self.codec_options, self.read_preference, self.write_concern, self.read_concern) cursor = dbo.list_collections( session=session, filter={"name": self.__name}) result = None for doc in cursor: result = doc break if not result: return {} options = result.get("options", {}) if "create" in options: del options["create"] return options def _aggregate(self, pipeline, cursor_class, first_batch_size, session, explicit_session, **kwargs): common.validate_list('pipeline', pipeline) if "explain" in kwargs: raise ConfigurationError("The explain option is not supported. " "Use Database.command instead.") collation = validate_collation_or_none(kwargs.pop('collation', None)) max_await_time_ms = kwargs.pop('maxAwaitTimeMS', None) cmd = SON([("aggregate", self.__name), ("pipeline", pipeline)]) # Remove things that are not command options. use_cursor = True if "useCursor" in kwargs: warnings.warn( "The useCursor option is deprecated " "and will be removed in PyMongo 4.0", DeprecationWarning, stacklevel=2) use_cursor = common.validate_boolean( "useCursor", kwargs.pop("useCursor")) batch_size = common.validate_non_negative_integer_or_none( "batchSize", kwargs.pop("batchSize", None)) # If the server does not support the "cursor" option we # ignore useCursor and batchSize. with self._socket_for_reads(session) as (sock_info, slave_ok): dollar_out = pipeline and '$out' in pipeline[-1] if use_cursor: if "cursor" not in kwargs: kwargs["cursor"] = {} # Ignore batchSize when the $out pipeline stage is used. # batchSize is meaningless in that case since the server # doesn't return results. This also avoids SERVER-23923. if first_batch_size is not None and not dollar_out: kwargs["cursor"]["batchSize"] = first_batch_size cmd.update(kwargs) # Apply this Collection's read concern if $out is not in the # pipeline. if (sock_info.max_wire_version >= 4 and 'readConcern' not in cmd and not dollar_out): read_concern = self.read_concern else: read_concern = None if 'writeConcern' not in cmd and dollar_out: write_concern = self._write_concern_for(session) else: write_concern = None # Avoid auto-injecting a session: aggregate() passes a session, # aggregate_raw_batches() passes none. result = sock_info.command( self.__database.name, cmd, slave_ok, self._read_preference_for(session), self.codec_options, parse_write_concern_error=True, read_concern=read_concern, write_concern=write_concern, collation=collation, session=session, client=self.__database.client) if "cursor" in result: cursor = result["cursor"] else: # Pre-MongoDB 2.6 or unacknowledged write. Fake a cursor. cursor = { "id": 0, "firstBatch": result.get("result", []), "ns": self.full_name, } return cursor_class( self, cursor, sock_info.address, batch_size=batch_size or 0, max_await_time_ms=max_await_time_ms, session=session, explicit_session=explicit_session) def aggregate(self, pipeline, session=None, **kwargs): """Perform an aggregation using the aggregation framework on this collection. All optional `aggregate command`_ parameters should be passed as keyword arguments to this method. Valid options include, but are not limited to: - `allowDiskUse` (bool): Enables writing to temporary files. When set to True, aggregation stages can write data to the _tmp subdirectory of the --dbpath directory. The default is False. - `maxTimeMS` (int): The maximum amount of time to allow the operation to run in milliseconds. - `batchSize` (int): The maximum number of documents to return per batch. Ignored if the connected mongod or mongos does not support returning aggregate results using a cursor, or `useCursor` is ``False``. - `collation` (optional): An instance of :class:`~pymongo.collation.Collation`. This option is only supported on MongoDB 3.4 and above. - `useCursor` (bool): Deprecated. Will be removed in PyMongo 4.0. The :meth:`aggregate` method obeys the :attr:`read_preference` of this :class:`Collection`. Please note that using the ``$out`` pipeline stage requires a read preference of :attr:`~pymongo.read_preferences.ReadPreference.PRIMARY` (the default). The server will raise an error if the ``$out`` pipeline stage is used with any other read preference. .. note:: This method does not support the 'explain' option. Please use :meth:`~pymongo.database.Database.command` instead. An example is included in the :ref:`aggregate-examples` documentation. .. note:: The :attr:`~pymongo.collection.Collection.write_concern` of this collection is automatically applied to this operation when using MongoDB >= 3.4. :Parameters: - `pipeline`: a list of aggregation pipeline stages - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs` (optional): See list of options above. :Returns: A :class:`~pymongo.command_cursor.CommandCursor` over the result set. .. versionchanged:: 3.6 Added the `session` parameter. Added the `maxAwaitTimeMS` option. Deprecated the `useCursor` option. .. versionchanged:: 3.4 Apply this collection's write concern automatically to this operation when connected to MongoDB >= 3.4. Support the `collation` option. .. versionchanged:: 3.0 The :meth:`aggregate` method always returns a CommandCursor. The pipeline argument must be a list. .. versionchanged:: 2.7 When the cursor option is used, return :class:`~pymongo.command_cursor.CommandCursor` instead of :class:`~pymongo.cursor.Cursor`. .. versionchanged:: 2.6 Added cursor support. .. versionadded:: 2.3 .. seealso:: :doc:`/examples/aggregation` .. _aggregate command: https://docs.mongodb.com/manual/reference/command/aggregate """ with self.__database.client._tmp_session(session, close=False) as s: return self._aggregate(pipeline, CommandCursor, kwargs.get('batchSize'), session=s, explicit_session=session is not None, **kwargs) def aggregate_raw_batches(self, pipeline, **kwargs): """Perform an aggregation and retrieve batches of raw BSON. Similar to the :meth:`aggregate` method but returns a :class:`~pymongo.cursor.RawBatchCursor`. This example demonstrates how to work with raw batches, but in practice raw batches should be passed to an external library that can decode BSON into another data type, rather than used with PyMongo's :mod:`bson` module. >>> import bson >>> cursor = db.test.aggregate_raw_batches([ ... {'$project': {'x': {'$multiply': [2, '$x']}}}]) >>> for batch in cursor: ... print(bson.decode_all(batch)) .. note:: aggregate_raw_batches does not support sessions. .. versionadded:: 3.6 """ # OP_MSG with document stream returns is required to support # sessions. if "session" in kwargs: raise ConfigurationError( "aggregate_raw_batches does not support sessions") return self._aggregate(pipeline, RawBatchCommandCursor, 0, None, False, **kwargs) def watch(self, pipeline=None, full_document='default', resume_after=None, max_await_time_ms=None, batch_size=None, collation=None, start_at_operation_time=None, session=None): """Watch changes on this collection. Performs an aggregation with an implicit initial ``$changeStream`` stage and returns a :class:`~pymongo.change_stream.CollectionChangeStream` cursor which iterates over changes on this collection. Introduced in MongoDB 3.6. .. code-block:: python with db.collection.watch() as stream: for change in stream: print(change) The :class:`~pymongo.change_stream.CollectionChangeStream` iterable blocks until the next change document is returned or an error is raised. If the :meth:`~pymongo.change_stream.CollectionChangeStream.next` method encounters a network error when retrieving a batch from the server, it will automatically attempt to recreate the cursor such that no change events are missed. Any error encountered during the resume attempt indicates there may be an outage and will be raised. .. code-block:: python try: with db.collection.watch( [{'$match': {'operationType': 'insert'}}]) as stream: for insert_change in stream: print(insert_change) except pymongo.errors.PyMongoError: # The ChangeStream encountered an unrecoverable error or the # resume attempt failed to recreate the cursor. logging.error('...') For a precise description of the resume process see the `change streams specification`_. .. note:: Using this helper method is preferred to directly calling :meth:`~pymongo.collection.Collection.aggregate` with a ``$changeStream`` stage, for the purpose of supporting resumability. .. warning:: This Collection's :attr:`read_concern` must be ``ReadConcern("majority")`` in order to use the ``$changeStream`` stage. :Parameters: - `pipeline` (optional): A list of aggregation pipeline stages to append to an initial ``$changeStream`` stage. Not all pipeline stages are valid after a ``$changeStream`` stage, see the MongoDB documentation on change streams for the supported stages. - `full_document` (optional): The fullDocument to pass as an option to the ``$changeStream`` stage. Allowed values: 'default', 'updateLookup'. Defaults to 'default'. When set to 'updateLookup', the change notification for partial updates will include both a delta describing the changes to the document, as well as a copy of the entire document that was changed from some time after the change occurred. - `resume_after` (optional): The logical starting point for this change stream. - `max_await_time_ms` (optional): The maximum time in milliseconds for the server to wait for changes before responding to a getMore operation. - `batch_size` (optional): The maximum number of documents to return per batch. - `collation` (optional): The :class:`~pymongo.collation.Collation` to use for the aggregation. - `start_at_operation_time` (optional): If provided, the resulting change stream will only return changes that occurred at or after the specified :class:`~bson.timestamp.Timestamp`. Requires MongoDB >= 4.0. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. :Returns: A :class:`~pymongo.change_stream.CollectionChangeStream` cursor. .. versionchanged:: 3.7 Added the ``start_at_operation_time`` parameter. .. versionadded:: 3.6 .. mongodoc:: changeStreams .. _change streams specification: https://github.com/mongodb/specifications/blob/master/source/change-streams/change-streams.rst """ return CollectionChangeStream( self, pipeline, full_document, resume_after, max_await_time_ms, batch_size, collation, start_at_operation_time, session ) def group(self, key, condition, initial, reduce, finalize=None, **kwargs): """Perform a query similar to an SQL *group by* operation. **DEPRECATED** - The group command was deprecated in MongoDB 3.4. The :meth:`~group` method is deprecated and will be removed in PyMongo 4.0. Use :meth:`~aggregate` with the `$group` stage or :meth:`~map_reduce` instead. .. versionchanged:: 3.5 Deprecated the group method. .. versionchanged:: 3.4 Added the `collation` option. .. versionchanged:: 2.2 Removed deprecated argument: command """ warnings.warn("The group method is deprecated and will be removed in " "PyMongo 4.0. Use the aggregate method with the $group " "stage or the map_reduce method instead.", DeprecationWarning, stacklevel=2) group = {} if isinstance(key, string_type): group["$keyf"] = Code(key) elif key is not None: group = {"key": helpers._fields_list_to_dict(key, "key")} group["ns"] = self.__name group["$reduce"] = Code(reduce) group["cond"] = condition group["initial"] = initial if finalize is not None: group["finalize"] = Code(finalize) cmd = SON([("group", group)]) collation = validate_collation_or_none(kwargs.pop('collation', None)) cmd.update(kwargs) with self._socket_for_reads(session=None) as (sock_info, slave_ok): return self._command(sock_info, cmd, slave_ok, collation=collation)["retval"] def rename(self, new_name, session=None, **kwargs): """Rename this collection. If operating in auth mode, client must be authorized as an admin to perform this operation. Raises :class:`TypeError` if `new_name` is not an instance of :class:`basestring` (:class:`str` in python 3). Raises :class:`~pymongo.errors.InvalidName` if `new_name` is not a valid collection name. :Parameters: - `new_name`: new name for this collection - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs` (optional): additional arguments to the rename command may be passed as keyword arguments to this helper method (i.e. ``dropTarget=True``) .. note:: The :attr:`~pymongo.collection.Collection.write_concern` of this collection is automatically applied to this operation when using MongoDB >= 3.4. .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.4 Apply this collection's write concern automatically to this operation when connected to MongoDB >= 3.4. """ if not isinstance(new_name, string_type): raise TypeError("new_name must be an " "instance of %s" % (string_type.__name__,)) if not new_name or ".." in new_name: raise InvalidName("collection names cannot be empty") if new_name[0] == "." or new_name[-1] == ".": raise InvalidName("collecion names must not start or end with '.'") if "$" in new_name and not new_name.startswith("oplog.$main"): raise InvalidName("collection names must not contain '$'") new_name = "%s.%s" % (self.__database.name, new_name) cmd = SON([("renameCollection", self.__full_name), ("to", new_name)]) cmd.update(kwargs) write_concern = self._write_concern_for_cmd(cmd, session) with self._socket_for_writes() as sock_info: with self.__database.client._tmp_session(session) as s: return sock_info.command( 'admin', cmd, write_concern=write_concern, parse_write_concern_error=True, session=s, client=self.__database.client) def distinct(self, key, filter=None, session=None, **kwargs): """Get a list of distinct values for `key` among all documents in this collection. Raises :class:`TypeError` if `key` is not an instance of :class:`basestring` (:class:`str` in python 3). All optional distinct parameters should be passed as keyword arguments to this method. Valid options include: - `maxTimeMS` (int): The maximum amount of time to allow the count command to run, in milliseconds. - `collation` (optional): An instance of :class:`~pymongo.collation.Collation`. This option is only supported on MongoDB 3.4 and above. The :meth:`distinct` method obeys the :attr:`read_preference` of this :class:`Collection`. :Parameters: - `key`: name of the field for which we want to get the distinct values - `filter` (optional): A query document that specifies the documents from which to retrieve the distinct values. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs` (optional): See list of options above. .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.4 Support the `collation` option. """ if not isinstance(key, string_type): raise TypeError("key must be an " "instance of %s" % (string_type.__name__,)) cmd = SON([("distinct", self.__name), ("key", key)]) if filter is not None: if "query" in kwargs: raise ConfigurationError("can't pass both filter and query") kwargs["query"] = filter collation = validate_collation_or_none(kwargs.pop('collation', None)) cmd.update(kwargs) with self._socket_for_reads(session) as (sock_info, slave_ok): return self._command(sock_info, cmd, slave_ok, read_concern=self.read_concern, collation=collation, session=session)["values"] def map_reduce(self, map, reduce, out, full_response=False, session=None, **kwargs): """Perform a map/reduce operation on this collection. If `full_response` is ``False`` (default) returns a :class:`~pymongo.collection.Collection` instance containing the results of the operation. Otherwise, returns the full response from the server to the `map reduce command`_. :Parameters: - `map`: map function (as a JavaScript string) - `reduce`: reduce function (as a JavaScript string) - `out`: output collection name or `out object` (dict). See the `map reduce command`_ documentation for available options. Note: `out` options are order sensitive. :class:`~bson.son.SON` can be used to specify multiple options. e.g. SON([('replace', ), ('db', )]) - `full_response` (optional): if ``True``, return full response to this command - otherwise just return the result collection - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs` (optional): additional arguments to the `map reduce command`_ may be passed as keyword arguments to this helper method, e.g.:: >>> db.test.map_reduce(map, reduce, "myresults", limit=2) .. note:: The :meth:`map_reduce` method does **not** obey the :attr:`read_preference` of this :class:`Collection`. To run mapReduce on a secondary use the :meth:`inline_map_reduce` method instead. .. note:: The :attr:`~pymongo.collection.Collection.write_concern` of this collection is automatically applied to this operation (if the output is not inline) when using MongoDB >= 3.4. .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.4 Apply this collection's write concern automatically to this operation when connected to MongoDB >= 3.4. .. seealso:: :doc:`/examples/aggregation` .. versionchanged:: 3.4 Added the `collation` option. .. versionchanged:: 2.2 Removed deprecated arguments: merge_output and reduce_output .. _map reduce command: http://docs.mongodb.org/manual/reference/command/mapReduce/ .. mongodoc:: mapreduce """ if not isinstance(out, (string_type, abc.Mapping)): raise TypeError("'out' must be an instance of " "%s or a mapping" % (string_type.__name__,)) cmd = SON([("mapreduce", self.__name), ("map", map), ("reduce", reduce), ("out", out)]) collation = validate_collation_or_none(kwargs.pop('collation', None)) cmd.update(kwargs) inline = 'inline' in cmd['out'] sock_ctx, read_pref = self._socket_for_primary_reads(session) with sock_ctx as (sock_info, slave_ok): if (sock_info.max_wire_version >= 4 and 'readConcern' not in cmd and inline): read_concern = self.read_concern else: read_concern = None if 'writeConcern' not in cmd and not inline: write_concern = self._write_concern_for(session) else: write_concern = None response = self._command( sock_info, cmd, slave_ok, read_pref, read_concern=read_concern, write_concern=write_concern, collation=collation, session=session) if full_response or not response.get('result'): return response elif isinstance(response['result'], dict): dbase = response['result']['db'] coll = response['result']['collection'] return self.__database.client[dbase][coll] else: return self.__database[response["result"]] def inline_map_reduce(self, map, reduce, full_response=False, session=None, **kwargs): """Perform an inline map/reduce operation on this collection. Perform the map/reduce operation on the server in RAM. A result collection is not created. The result set is returned as a list of documents. If `full_response` is ``False`` (default) returns the result documents in a list. Otherwise, returns the full response from the server to the `map reduce command`_. The :meth:`inline_map_reduce` method obeys the :attr:`read_preference` of this :class:`Collection`. :Parameters: - `map`: map function (as a JavaScript string) - `reduce`: reduce function (as a JavaScript string) - `full_response` (optional): if ``True``, return full response to this command - otherwise just return the result collection - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs` (optional): additional arguments to the `map reduce command`_ may be passed as keyword arguments to this helper method, e.g.:: >>> db.test.inline_map_reduce(map, reduce, limit=2) .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.4 Added the `collation` option. """ cmd = SON([("mapreduce", self.__name), ("map", map), ("reduce", reduce), ("out", {"inline": 1})]) collation = validate_collation_or_none(kwargs.pop('collation', None)) cmd.update(kwargs) with self._socket_for_reads(session) as (sock_info, slave_ok): if sock_info.max_wire_version >= 4 and 'readConcern' not in cmd: res = self._command(sock_info, cmd, slave_ok, read_concern=self.read_concern, collation=collation, session=session) else: res = self._command(sock_info, cmd, slave_ok, collation=collation, session=session) if full_response: return res else: return res.get("results") def _write_concern_for_cmd(self, cmd, session): raw_wc = cmd.get('writeConcern') if raw_wc is not None: return WriteConcern(**raw_wc) else: return self._write_concern_for(session) def __find_and_modify(self, filter, projection, sort, upsert=None, return_document=ReturnDocument.BEFORE, array_filters=None, session=None, **kwargs): """Internal findAndModify helper.""" common.validate_is_mapping("filter", filter) if not isinstance(return_document, bool): raise ValueError("return_document must be " "ReturnDocument.BEFORE or ReturnDocument.AFTER") collation = validate_collation_or_none(kwargs.pop('collation', None)) cmd = SON([("findAndModify", self.__name), ("query", filter), ("new", return_document)]) cmd.update(kwargs) if projection is not None: cmd["fields"] = helpers._fields_list_to_dict(projection, "projection") if sort is not None: cmd["sort"] = helpers._index_document(sort) if upsert is not None: common.validate_boolean("upsert", upsert) cmd["upsert"] = upsert write_concern = self._write_concern_for_cmd(cmd, session) def _find_and_modify(session, sock_info, retryable_write): if array_filters is not None: if sock_info.max_wire_version < 6: raise ConfigurationError( 'Must be connected to MongoDB 3.6+ to use ' 'arrayFilters.') if not write_concern.acknowledged: raise ConfigurationError( 'arrayFilters is unsupported for unacknowledged ' 'writes.') cmd["arrayFilters"] = array_filters if (sock_info.max_wire_version >= 4 and not write_concern.is_server_default): cmd['writeConcern'] = write_concern.document out = self._command(sock_info, cmd, read_preference=ReadPreference.PRIMARY, write_concern=write_concern, allowable_errors=[_NO_OBJ_ERROR], collation=collation, session=session, retryable_write=retryable_write) _check_write_command_response(out) return out.get("value") return self.__database.client._retryable_write( write_concern.acknowledged, _find_and_modify, session) def find_one_and_delete(self, filter, projection=None, sort=None, session=None, **kwargs): """Finds a single document and deletes it, returning the document. >>> db.test.count_documents({'x': 1}) 2 >>> db.test.find_one_and_delete({'x': 1}) {u'x': 1, u'_id': ObjectId('54f4e12bfba5220aa4d6dee8')} >>> db.test.count_documents({'x': 1}) 1 If multiple documents match *filter*, a *sort* can be applied. >>> for doc in db.test.find({'x': 1}): ... print(doc) ... {u'x': 1, u'_id': 0} {u'x': 1, u'_id': 1} {u'x': 1, u'_id': 2} >>> db.test.find_one_and_delete( ... {'x': 1}, sort=[('_id', pymongo.DESCENDING)]) {u'x': 1, u'_id': 2} The *projection* option can be used to limit the fields returned. >>> db.test.find_one_and_delete({'x': 1}, projection={'_id': False}) {u'x': 1} :Parameters: - `filter`: A query that matches the document to delete. - `projection` (optional): a list of field names that should be returned in the result document or a mapping specifying the fields to include or exclude. If `projection` is a list "_id" will always be returned. Use a mapping to exclude fields from the result (e.g. projection={'_id': False}). - `sort` (optional): a list of (key, direction) pairs specifying the sort order for the query. If multiple documents match the query, they are sorted and the first is deleted. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs` (optional): additional command arguments can be passed as keyword arguments (for example maxTimeMS can be used with recent server versions). .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.2 Respects write concern. .. warning:: Starting in PyMongo 3.2, this command uses the :class:`~pymongo.write_concern.WriteConcern` of this :class:`~pymongo.collection.Collection` when connected to MongoDB >= 3.2. Note that using an elevated write concern with this command may be slower compared to using the default write concern. .. versionchanged:: 3.4 Added the `collation` option. .. versionadded:: 3.0 """ kwargs['remove'] = True return self.__find_and_modify(filter, projection, sort, session=session, **kwargs) def find_one_and_replace(self, filter, replacement, projection=None, sort=None, upsert=False, return_document=ReturnDocument.BEFORE, session=None, **kwargs): """Finds a single document and replaces it, returning either the original or the replaced document. The :meth:`find_one_and_replace` method differs from :meth:`find_one_and_update` by replacing the document matched by *filter*, rather than modifying the existing document. >>> for doc in db.test.find({}): ... print(doc) ... {u'x': 1, u'_id': 0} {u'x': 1, u'_id': 1} {u'x': 1, u'_id': 2} >>> db.test.find_one_and_replace({'x': 1}, {'y': 1}) {u'x': 1, u'_id': 0} >>> for doc in db.test.find({}): ... print(doc) ... {u'y': 1, u'_id': 0} {u'x': 1, u'_id': 1} {u'x': 1, u'_id': 2} :Parameters: - `filter`: A query that matches the document to replace. - `replacement`: The replacement document. - `projection` (optional): A list of field names that should be returned in the result document or a mapping specifying the fields to include or exclude. If `projection` is a list "_id" will always be returned. Use a mapping to exclude fields from the result (e.g. projection={'_id': False}). - `sort` (optional): a list of (key, direction) pairs specifying the sort order for the query. If multiple documents match the query, they are sorted and the first is replaced. - `upsert` (optional): When ``True``, inserts a new document if no document matches the query. Defaults to ``False``. - `return_document`: If :attr:`ReturnDocument.BEFORE` (the default), returns the original document before it was replaced, or ``None`` if no document matches. If :attr:`ReturnDocument.AFTER`, returns the replaced or inserted document. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs` (optional): additional command arguments can be passed as keyword arguments (for example maxTimeMS can be used with recent server versions). .. versionchanged:: 3.6 Added ``session`` parameter. .. versionchanged:: 3.4 Added the `collation` option. .. versionchanged:: 3.2 Respects write concern. .. warning:: Starting in PyMongo 3.2, this command uses the :class:`~pymongo.write_concern.WriteConcern` of this :class:`~pymongo.collection.Collection` when connected to MongoDB >= 3.2. Note that using an elevated write concern with this command may be slower compared to using the default write concern. .. versionadded:: 3.0 """ common.validate_ok_for_replace(replacement) kwargs['update'] = replacement return self.__find_and_modify(filter, projection, sort, upsert, return_document, session=session, **kwargs) def find_one_and_update(self, filter, update, projection=None, sort=None, upsert=False, return_document=ReturnDocument.BEFORE, array_filters=None, session=None, **kwargs): """Finds a single document and updates it, returning either the original or the updated document. >>> db.test.find_one_and_update( ... {'_id': 665}, {'$inc': {'count': 1}, '$set': {'done': True}}) {u'_id': 665, u'done': False, u'count': 25}} By default :meth:`find_one_and_update` returns the original version of the document before the update was applied. To return the updated version of the document instead, use the *return_document* option. >>> from pymongo import ReturnDocument >>> db.example.find_one_and_update( ... {'_id': 'userid'}, ... {'$inc': {'seq': 1}}, ... return_document=ReturnDocument.AFTER) {u'_id': u'userid', u'seq': 1} You can limit the fields returned with the *projection* option. >>> db.example.find_one_and_update( ... {'_id': 'userid'}, ... {'$inc': {'seq': 1}}, ... projection={'seq': True, '_id': False}, ... return_document=ReturnDocument.AFTER) {u'seq': 2} The *upsert* option can be used to create the document if it doesn't already exist. >>> db.example.delete_many({}).deleted_count 1 >>> db.example.find_one_and_update( ... {'_id': 'userid'}, ... {'$inc': {'seq': 1}}, ... projection={'seq': True, '_id': False}, ... upsert=True, ... return_document=ReturnDocument.AFTER) {u'seq': 1} If multiple documents match *filter*, a *sort* can be applied. >>> for doc in db.test.find({'done': True}): ... print(doc) ... {u'_id': 665, u'done': True, u'result': {u'count': 26}} {u'_id': 701, u'done': True, u'result': {u'count': 17}} >>> db.test.find_one_and_update( ... {'done': True}, ... {'$set': {'final': True}}, ... sort=[('_id', pymongo.DESCENDING)]) {u'_id': 701, u'done': True, u'result': {u'count': 17}} :Parameters: - `filter`: A query that matches the document to update. - `update`: The update operations to apply. - `projection` (optional): A list of field names that should be returned in the result document or a mapping specifying the fields to include or exclude. If `projection` is a list "_id" will always be returned. Use a dict to exclude fields from the result (e.g. projection={'_id': False}). - `sort` (optional): a list of (key, direction) pairs specifying the sort order for the query. If multiple documents match the query, they are sorted and the first is updated. - `upsert` (optional): When ``True``, inserts a new document if no document matches the query. Defaults to ``False``. - `return_document`: If :attr:`ReturnDocument.BEFORE` (the default), returns the original document before it was updated, or ``None`` if no document matches. If :attr:`ReturnDocument.AFTER`, returns the updated or inserted document. - `array_filters` (optional): A list of filters specifying which array elements an update should apply. Requires MongoDB 3.6+. - `session` (optional): a :class:`~pymongo.client_session.ClientSession`. - `**kwargs` (optional): additional command arguments can be passed as keyword arguments (for example maxTimeMS can be used with recent server versions). .. versionchanged:: 3.6 Added the `array_filters` and `session` options. .. versionchanged:: 3.4 Added the `collation` option. .. versionchanged:: 3.2 Respects write concern. .. warning:: Starting in PyMongo 3.2, this command uses the :class:`~pymongo.write_concern.WriteConcern` of this :class:`~pymongo.collection.Collection` when connected to MongoDB >= 3.2. Note that using an elevated write concern with this command may be slower compared to using the default write concern. .. versionadded:: 3.0 """ common.validate_ok_for_update(update) common.validate_list_or_none('array_filters', array_filters) kwargs['update'] = update return self.__find_and_modify(filter, projection, sort, upsert, return_document, array_filters, session=session, **kwargs) def save(self, to_save, manipulate=True, check_keys=True, **kwargs): """Save a document in this collection. **DEPRECATED** - Use :meth:`insert_one` or :meth:`replace_one` instead. .. versionchanged:: 3.0 Removed the `safe` parameter. Pass ``w=0`` for unacknowledged write operations. """ warnings.warn("save is deprecated. Use insert_one or replace_one " "instead", DeprecationWarning, stacklevel=2) common.validate_is_document_type("to_save", to_save) write_concern = None collation = validate_collation_or_none(kwargs.pop('collation', None)) if kwargs: write_concern = WriteConcern(**kwargs) if not (isinstance(to_save, RawBSONDocument) or "_id" in to_save): return self._insert( to_save, True, check_keys, manipulate, write_concern) else: self._update_retryable( {"_id": to_save["_id"]}, to_save, True, check_keys, False, manipulate, write_concern, collation=collation) return to_save.get("_id") def insert(self, doc_or_docs, manipulate=True, check_keys=True, continue_on_error=False, **kwargs): """Insert a document(s) into this collection. **DEPRECATED** - Use :meth:`insert_one` or :meth:`insert_many` instead. .. versionchanged:: 3.0 Removed the `safe` parameter. Pass ``w=0`` for unacknowledged write operations. """ warnings.warn("insert is deprecated. Use insert_one or insert_many " "instead.", DeprecationWarning, stacklevel=2) write_concern = None if kwargs: write_concern = WriteConcern(**kwargs) return self._insert(doc_or_docs, not continue_on_error, check_keys, manipulate, write_concern) def update(self, spec, document, upsert=False, manipulate=False, multi=False, check_keys=True, **kwargs): """Update a document(s) in this collection. **DEPRECATED** - Use :meth:`replace_one`, :meth:`update_one`, or :meth:`update_many` instead. .. versionchanged:: 3.0 Removed the `safe` parameter. Pass ``w=0`` for unacknowledged write operations. """ warnings.warn("update is deprecated. Use replace_one, update_one or " "update_many instead.", DeprecationWarning, stacklevel=2) common.validate_is_mapping("spec", spec) common.validate_is_mapping("document", document) if document: # If a top level key begins with '$' this is a modify operation # and we should skip key validation. It doesn't matter which key # we check here. Passing a document with a mix of top level keys # starting with and without a '$' is invalid and the server will # raise an appropriate exception. first = next(iter(document)) if first.startswith('$'): check_keys = False write_concern = None collation = validate_collation_or_none(kwargs.pop('collation', None)) if kwargs: write_concern = WriteConcern(**kwargs) return self._update_retryable( spec, document, upsert, check_keys, multi, manipulate, write_concern, collation=collation) def remove(self, spec_or_id=None, multi=True, **kwargs): """Remove a document(s) from this collection. **DEPRECATED** - Use :meth:`delete_one` or :meth:`delete_many` instead. .. versionchanged:: 3.0 Removed the `safe` parameter. Pass ``w=0`` for unacknowledged write operations. """ warnings.warn("remove is deprecated. Use delete_one or delete_many " "instead.", DeprecationWarning, stacklevel=2) if spec_or_id is None: spec_or_id = {} if not isinstance(spec_or_id, abc.Mapping): spec_or_id = {"_id": spec_or_id} write_concern = None collation = validate_collation_or_none(kwargs.pop('collation', None)) if kwargs: write_concern = WriteConcern(**kwargs) return self._delete_retryable( spec_or_id, multi, write_concern, collation=collation) def find_and_modify(self, query={}, update=None, upsert=False, sort=None, full_response=False, manipulate=False, **kwargs): """Update and return an object. **DEPRECATED** - Use :meth:`find_one_and_delete`, :meth:`find_one_and_replace`, or :meth:`find_one_and_update` instead. """ warnings.warn("find_and_modify is deprecated, use find_one_and_delete" ", find_one_and_replace, or find_one_and_update instead", DeprecationWarning, stacklevel=2) if not update and not kwargs.get('remove', None): raise ValueError("Must either update or remove") if update and kwargs.get('remove', None): raise ValueError("Can't do both update and remove") # No need to include empty args if query: kwargs['query'] = query if update: kwargs['update'] = update if upsert: kwargs['upsert'] = upsert if sort: # Accept a list of tuples to match Cursor's sort parameter. if isinstance(sort, list): kwargs['sort'] = helpers._index_document(sort) # Accept OrderedDict, SON, and dict with len == 1 so we # don't break existing code already using find_and_modify. elif (isinstance(sort, ORDERED_TYPES) or isinstance(sort, dict) and len(sort) == 1): warnings.warn("Passing mapping types for `sort` is deprecated," " use a list of (key, direction) pairs instead", DeprecationWarning, stacklevel=2) kwargs['sort'] = sort else: raise TypeError("sort must be a list of (key, direction) " "pairs, a dict of len 1, or an instance of " "SON or OrderedDict") fields = kwargs.pop("fields", None) if fields is not None: kwargs["fields"] = helpers._fields_list_to_dict(fields, "fields") collation = validate_collation_or_none(kwargs.pop('collation', None)) cmd = SON([("findAndModify", self.__name)]) cmd.update(kwargs) write_concern = self._write_concern_for_cmd(cmd, None) def _find_and_modify(session, sock_info, retryable_write): if (sock_info.max_wire_version >= 4 and not write_concern.is_server_default): cmd['writeConcern'] = write_concern.document result = self._command( sock_info, cmd, read_preference=ReadPreference.PRIMARY, allowable_errors=[_NO_OBJ_ERROR], collation=collation, session=session, retryable_write=retryable_write) _check_write_command_response(result) return result out = self.__database.client._retryable_write( write_concern.acknowledged, _find_and_modify, None) if not out['ok']: if out["errmsg"] == _NO_OBJ_ERROR: return None else: # Should never get here b/c of allowable_errors raise ValueError("Unexpected Error: %s" % (out,)) if full_response: return out else: document = out.get('value') if manipulate: document = self.__database._fix_outgoing(document, self) return document def __iter__(self): return self def __next__(self): raise TypeError("'Collection' object is not iterable") next = __next__ def __call__(self, *args, **kwargs): """This is only here so that some API misusages are easier to debug. """ if "." not in self.__name: raise TypeError("'Collection' object is not callable. If you " "meant to call the '%s' method on a 'Database' " "object it is failing because no such method " "exists." % self.__name) raise TypeError("'Collection' object is not callable. If you meant to " "call the '%s' method on a 'Collection' object it is " "failing because no such method exists." % self.__name.split(".")[-1])