forked from mongodb/motor
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docstrings.py
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docstrings.py
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# Copyright 2016 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.
get_database_doc = """
Get a :class:`MotorDatabase` with the given name and options.
Useful for creating a :class:`MotorDatabase` with different codec options,
read preference, and/or write concern from this :class:`MotorClient`.
>>> from pymongo import ReadPreference
>>> client.read_preference == ReadPreference.PRIMARY
True
>>> db1 = client.test
>>> db1.read_preference == ReadPreference.PRIMARY
True
>>> db2 = client.get_database(
... 'test', read_preference=ReadPreference.SECONDARY)
>>> db2.read_preference == ReadPreference.SECONDARY
True
:Parameters:
- `name`: The name of the database - a string.
- `codec_options` (optional): An instance of
:class:`~bson.codec_options.CodecOptions`. If ``None`` (the
default) the :attr:`codec_options` of this :class:`MotorClient` is
used.
- `read_preference` (optional): The read preference to use. If
``None`` (the default) the :attr:`read_preference` of this
:class:`MotorClient` 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:`MotorClient` is
used.
"""
get_default_database_doc = """
Get the database named in the MongoDB connection URI.
>>> uri = 'mongodb://host/my_database'
>>> client = MotorClient(uri)
>>> db = client.get_default_database()
>>> assert db.name == 'my_database'
>>> db = client.get_default_database('fallback_db_name')
>>> assert db.name == 'my_database'
>>> uri_without_database = 'mongodb://host/'
>>> client = MotorClient(uri_without_database)
>>> db = client.get_default_database('fallback_db_name')
>>> assert db.name == 'fallback_db_name'
Useful in scripts where you want to choose which database to use
based only on the URI in a configuration file.
:Parameters:
- `default` (optional): the database name to use if no database name
was provided in the URI.
- `codec_options` (optional): An instance of
:class:`~bson.codec_options.CodecOptions`. If ``None`` (the
default) the :attr:`codec_options` of this :class:`MotorClient` is
used.
- `read_preference` (optional): The read preference to use. If
``None`` (the default) the :attr:`read_preference` of this
:class:`MotorClient` 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:`MotorClient` is
used.
- `read_concern` (optional): An instance of
:class:`~pymongo.read_concern.ReadConcern`. If ``None`` (the
default) the :attr:`read_concern` of this :class:`MotorClient` is
used.
- `comment` (optional): A user-provided comment to attach to this command.
.. versionchanged:: 3.0
Added ``comment`` parameter.
.. versionadded:: 2.1
Revived this method. Added the ``default``, ``codec_options``,
``read_preference``, ``write_concern`` and ``read_concern`` parameters.
.. versionchanged:: 2.0
Removed this method.
"""
list_collection_names_doc = """
Get a list of all the collection names in this database.
For example, to list all non-system collections::
filter = {"name": {"$regex": r"^(?!system\\.)"}}
names = await db.list_collection_names(filter=filter)
:Parameters:
- `session` (optional): a
:class:`~pymongo.client_session.ClientSession`, created with
:meth:`~MotorClient.start_session`.
- `filter` (optional): A query document to filter the list of
collections returned from the listCollections command.
- `comment` (optional): A user-provided comment to attach to this command.
- `**kwargs` (optional): Optional parameters of the
`listCollections
<https://www.mongodb.com/docs/manual/reference/command/listCollections/>`_ comand.
can be passed as keyword arguments to this method. The supported
options differ by server version.
.. versionchanged:: 3.0
Added the ``comment`` parameter.
.. versionchanged:: 2.1
Added the ``filter`` and ``**kwargs`` parameters.
.. versionadded:: 1.2
"""
bulk_write_doc = """Send a batch of write operations to the server.
Requests are passed as a list of write operation instances imported
from :mod:`pymongo`:
: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 example, say we have these documents::
{'x': 1, '_id': ObjectId('54f62e60fba5226811f634ef')}
{'x': 1, '_id': ObjectId('54f62e60fba5226811f634f0')}
We can insert a document, delete one, and replace one like so::
# DeleteMany, UpdateOne, and UpdateMany are also available.
from pymongo import InsertOne, DeleteOne, ReplaceOne
async def modify_data():
requests = [InsertOne({'y': 1}), DeleteOne({'x': 1}),
ReplaceOne({'w': 1}, {'z': 1}, upsert=True)]
result = await db.test.bulk_write(requests)
print("inserted %d, deleted %d, modified %d" % (
result.inserted_count, result.deleted_count, result.modified_count))
print("upserted_ids: %s" % result.upserted_ids)
print("collection:")
async for doc in db.test.find():
print(doc)
This will print something like::
inserted 1, deleted 1, modified 0
upserted_ids: {2: ObjectId('54f62ee28891e756a6e1abd5')}
collection:
{'x': 1, '_id': ObjectId('54f62e60fba5226811f634f0')}
{'y': 1, '_id': ObjectId('54f62ee2fba5226811f634f1')}
{'z': 1, '_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`, created with
:meth:`~MotorClient.start_session`.
- `comment` (optional): A user-provided comment to attach to this command.
:Returns:
An instance of :class:`~pymongo.results.BulkWriteResult`.
.. seealso:: :ref:`writes-and-ids`
.. note:: `bypass_document_validation` requires server version
**>= 3.2**
.. versionchanged:: 3.0
Added comment parameter.
.. versionchanged:: 1.2
Added session parameter.
"""
create_indexes_doc = """Create one or more indexes on this collection::
from pymongo import IndexModel, ASCENDING, DESCENDING
async def create_two_indexes():
index1 = IndexModel([("hello", DESCENDING),
("world", ASCENDING)], name="hello_world")
index2 = IndexModel([("goodbye", DESCENDING)])
print(await db.test.create_indexes([index1, index2]))
This prints::
['hello_world', 'goodbye_-1']
:Parameters:
- `indexes`: A list of :class:`~pymongo.operations.IndexModel`
instances.
- `session` (optional): a
:class:`~pymongo.client_session.ClientSession`, created with
:meth:`~MotorClient.start_session`.
- `comment` (optional): A user-provided comment to attach to this command.
- `**kwargs` (optional): optional arguments to the createIndexes
command (like maxTimeMS) can be passed as keyword arguments.
The :attr:`~pymongo.collection.Collection.write_concern` of
this collection is automatically applied to this operation.
.. versionchanged:: 3.0
Added comment parameter.
.. versionchanged:: 1.2
Added session parameter.
"""
cmd_doc = """Issue a MongoDB command.
Send command ``command`` to the database and return the
response. If ``command`` is a string then the command ``{command: value}``
will be sent. Otherwise, ``command`` must be a
:class:`dict` and will be sent as-is.
Additional keyword arguments are added to the final
command document before it is sent.
For example, a command like ``{buildinfo: 1}`` can be sent
using::
result = await db.command("buildinfo")
For a command where the value matters, like ``{collstats:
collection_name}`` we can do::
result = await db.command("collstats", collection_name)
For commands that take additional arguments we can use
kwargs. So ``{filemd5: object_id, root: file_root}`` becomes::
result = await db.command("filemd5", object_id, root=file_root)
:Parameters:
- `command`: document representing the command to be issued,
or the name of the command (for simple commands only).
.. note:: the order of keys in the `command` document is
significant (the "verb" must come first), so commands
which require multiple keys (e.g. `findandmodify`)
should use an instance of :class:`~bson.son.SON` or
a string and kwargs instead of a Python :class:`dict`.
- `value` (optional): value to use for the command verb when
`command` is passed as a string
- `check` (optional): check the response for errors, raising
:class:`~pymongo.errors.OperationFailure` if there are any
- `allowable_errors`: if `check` is ``True``, error messages
in this list will be ignored by error-checking
- `read_preference`: The read preference for this operation.
See :mod:`~pymongo.read_preferences` for options.
- `session` (optional): a
:class:`~pymongo.client_session.ClientSession`, created with
:meth:`~MotorClient.start_session`.
- `comment` (optional): A user-provided comment to attach to this command.
- `**kwargs` (optional): additional keyword arguments will
be added to the command document before it is sent
.. versionchanged:: 3.0
Added comment parameter.
.. versionchanged:: 1.2
Added session parameter.
.. mongodoc:: commands
"""
delete_many_doc = """Delete one or more documents matching the filter.
If we have a collection with 3 documents like ``{'x': 1}``, then::
async def clear_collection():
result = await db.test.delete_many({'x': 1})
print(result.deleted_count)
This deletes all matching documents and prints "3".
:Parameters:
- `filter`: A query that matches the documents to delete.
- `collation` (optional): An instance of
:class:`~pymongo.collation.Collation`.
- `hint` (optional): An index used to support the query predicate specified
either by its string name, or in the same format as passed to
:meth:`~MotorDatabase.create_index` (e.g. ``[('field', ASCENDING)]``).
This option is only supported on MongoDB 4.4 and above.
- `session` (optional): a
:class:`~pymongo.client_session.ClientSession`, created with
:meth:`~MotorClient.start_session`.
- `comment` (optional): A user-provided comment to attach to this command.
:Returns:
- An instance of :class:`~pymongo.results.DeleteResult`.
.. versionchanged:: 3.0
Added ``comment`` parameter.
.. versionchanged:: 2.2
Added ``hint`` parameter.
.. versionchanged:: 1.2
Added ``session`` parameter.
"""
delete_one_doc = """Delete a single document matching the filter.
If we have a collection with 3 documents like ``{'x': 1}``, then::
async def clear_collection():
result = await db.test.delete_one({'x': 1})
print(result.deleted_count)
This deletes one matching document and prints "1".
:Parameters:
- `filter`: A query that matches the document to delete.
- `collation` (optional): An instance of
:class:`~pymongo.collation.Collation`.
- `hint` (optional): An index used to support the query predicate specified
either by its string name, or in the same format as passed to
:meth:`~MotorDatabase.create_index` (e.g. ``[('field', ASCENDING)]``).
This option is only supported on MongoDB 4.4 and above.
- `session` (optional): a
:class:`~pymongo.client_session.ClientSession`, created with
:meth:`~MotorClient.start_session`.
- `comment` (optional): A user-provided comment to attach to this command.
:Returns:
- An instance of :class:`~pymongo.results.DeleteResult`.
.. versionchanged:: 3.0
Added ``comment`` parameter.
.. versionchanged:: 2.2
Added ``hint`` parameter.
.. versionchanged:: 1.2
Added ``session`` parameter.
"""
drop_doc = """Alias for ``drop_collection``.
The following two calls are equivalent::
await db.foo.drop()
await db.drop_collection("foo")
"""
find_one_doc = """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 Motor collection instance.
: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`.
- `max_time_ms` (optional): a value for max_time_ms may be
specified as part of `**kwargs`, e.g.:
.. code-block:: python3
await collection.find_one(max_time_ms=100)
.. versionchanged:: 1.2
Added session parameter.
"""
find_one_and_delete_doc = """Finds a single document and deletes it, returning
the document.
If we have a collection with 2 documents like ``{'x': 1}``, then this code
retrieves and deletes one of them::
async def delete_one_document():
print(await db.test.count_documents({'x': 1}))
doc = await db.test.find_one_and_delete({'x': 1})
print(doc)
print(await db.test.count_documents({'x': 1}))
This outputs something like::
2
{'x': 1, '_id': ObjectId('54f4e12bfba5220aa4d6dee8')}
1
If multiple documents match *filter*, a *sort* can be applied. Say we have 3
documents like::
{'x': 1, '_id': 0}
{'x': 1, '_id': 1}
{'x': 1, '_id': 2}
This code retrieves and deletes the document with the largest ``_id``::
async def delete_with_largest_id():
doc = await db.test.find_one_and_delete(
{'x': 1}, sort=[('_id', pymongo.DESCENDING)])
This deletes one document and prints it::
{'x': 1, '_id': 2}
The *projection* option can be used to limit the fields returned::
async def delete_and_return_x():
db.test.find_one_and_delete({'x': 1}, projection={'_id': False})
This prints::
{'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.
- `hint` (optional): An index used to support the query predicate specified
either by its string name, or in the same format as passed to
:meth:`~MotorDatabase.create_index` (e.g. ``[('field', ASCENDING)]``).
This option is only supported on MongoDB 4.4 and above.
- `session` (optional): a
:class:`~pymongo.client_session.ClientSession`, created with
:meth:`~MotorClient.start_session`.
- `comment` (optional): A user-provided comment to attach to this command.
- `**kwargs` (optional): additional command arguments can be passed
as keyword arguments (for example maxTimeMS can be used with
recent server versions).
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:: 3.0
Added ``comment`` parameter.
.. versionchanged:: 2.2
Added ``hint`` parameter.
.. versionchanged:: 1.2
Added ``session`` parameter.
"""
find_one_and_replace_doc = """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.
Say we have 3 documents like::
{'x': 1, '_id': 0}
{'x': 1, '_id': 1}
{'x': 1, '_id': 2}
Replace one of them like so::
async def replace_one_doc():
original_doc = await db.test.find_one_and_replace({'x': 1}, {'y': 1})
print("original: %s" % original_doc)
print("collection:")
async for doc in db.test.find():
print(doc)
This will print::
original: {'x': 1, '_id': 0}
collection:
{'y': 1, '_id': 0}
{'x': 1, '_id': 1}
{'x': 1, '_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.
- `hint` (optional): An index to use to support the query
predicate specified either by its string name, or in the same
format as passed to
:meth:`~MotorDatabase.create_index` (e.g. ``[('field', ASCENDING)]``).
This option is only supported on MongoDB 4.4 and above.
- `session` (optional): a
:class:`~pymongo.client_session.ClientSession`, created with
:meth:`~MotorClient.start_session`.
- `comment` (optional): A user-provided comment to attach to this command.
- `**kwargs` (optional): additional command arguments can be passed
as keyword arguments (for example maxTimeMS can be used with
recent server versions).
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:: 3.0
Added ``comment`` parameter.
.. versionchanged:: 2.2
Added ``hint`` parameter.
.. versionchanged:: 1.2
Added ``session`` parameter.
"""
find_one_and_update_doc = """Finds a single document and updates it, returning
either the original or the updated document. By default
:meth:`find_one_and_update` returns the original version of
the document before the update was applied::
async def set_done():
print(await db.test.find_one_and_update(
{'_id': 665}, {'$inc': {'count': 1}, '$set': {'done': True}}))
This outputs::
{'_id': 665, 'done': False, 'count': 25}}
To return the updated version of the document instead, use the
*return_document* option. ::
from pymongo import ReturnDocument
async def increment_by_userid():
print(await db.example.find_one_and_update(
{'_id': 'userid'},
{'$inc': {'seq': 1}},
return_document=ReturnDocument.AFTER))
This prints::
{'_id': 'userid', 'seq': 1}
You can limit the fields returned with the *projection* option. ::
async def increment_by_userid():
print(await db.example.find_one_and_update(
{'_id': 'userid'},
{'$inc': {'seq': 1}},
projection={'seq': True, '_id': False},
return_document=ReturnDocument.AFTER))
This results in::
{'seq': 2}
The *upsert* option can be used to create the document if it doesn't
already exist. ::
async def increment_by_userid():
print(await db.example.find_one_and_update(
{'_id': 'userid'},
{'$inc': {'seq': 1}},
projection={'seq': True, '_id': False},
upsert=True,
return_document=ReturnDocument.AFTER))
The result::
{'seq': 1}
If multiple documents match *filter*, a *sort* can be applied.
Say we have these two documents::
{'_id': 665, 'done': True, 'result': {'count': 26}}
{'_id': 701, 'done': True, 'result': {'count': 17}}
Then to update the one with the great ``_id``::
async def set_done():
print(await db.test.find_one_and_update(
{'done': True},
{'$set': {'final': True}},
sort=[('_id', pymongo.DESCENDING)]))
This would print::
{'_id': 701, 'done': True, 'result': {'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+.
- `hint` (optional): An index to use to support the query
predicate specified either by its string name, or in the same
format as passed to
:meth:`~MotorDatabase.create_index` (e.g. ``[('field', ASCENDING)]``).
This option is only supported on MongoDB 4.4 and above.
- `session` (optional): a
:class:`~pymongo.client_session.ClientSession`, created with
:meth:`~MotorClient.start_session`.
- `comment` (optional): A user-provided comment to attach to this command.
- `**kwargs` (optional): additional command arguments can be passed
as keyword arguments (for example maxTimeMS can be used with
recent server versions).
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:: 3.0
Added ``comment`` parameter.
.. versionchanged:: 2.2
Added ``hint`` parameter.
.. versionchanged:: 1.2
Added ``array_filters`` and ``session`` parameters.
"""
index_information_doc = """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. For example::
async def create_x_index():
print(await db.test.create_index("x", unique=True))
print(await db.test.index_information())
This prints::
'x_1'
{'_id_': {'key': [('_id', 1)]},
'x_1': {'unique': True, 'key': [('x', 1)]}}
.. versionchanged:: 3.0
Added comment parameter.
.. versionchanged:: 1.2
Added session parameter.
"""
insert_many_doc = """Insert an iterable of documents. ::
async def insert_2_docs():
result = db.test.insert_many([{'x': i} for i in range(2)])
result.inserted_ids
This prints something like::
[ObjectId('54f113fffba522406c9cc20e'), ObjectId('54f113fffba522406c9cc20f')]
: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`, created with
:meth:`~MotorClient.start_session`.
- `comment` (optional): A user-provided comment to attach to this command.
:Returns:
An instance of :class:`~pymongo.results.InsertManyResult`.
.. seealso:: :ref:`writes-and-ids`
.. note:: `bypass_document_validation` requires server version
**>= 3.2**
.. versionchanged:: 3.0
Added comment parameter.
.. versionchanged:: 1.2
Added session parameter.
"""
insert_one_doc = """Insert a single document. ::
async def insert_x():
result = await db.test.insert_one({'x': 1})
print(result.inserted_id)
This code outputs the new document's ``_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`, created with
:meth:`~MotorClient.start_session`.
- `comment` (optional): A user-provided comment to attach to this command.
:Returns:
- An instance of :class:`~pymongo.results.InsertOneResult`.
.. seealso:: :ref:`writes-and-ids`
.. note:: `bypass_document_validation` requires server version
**>= 3.2**
.. versionchanged:: 3.0
Added comment parameter.
.. versionchanged:: 1.2
Added session parameter.
"""
mr_doc = """Perform a map/reduce operation on this collection.
If `full_response` is ``False`` (default) returns a
:class:`MotorCollection` 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', <collection name>), ('db', <database name>)])
- `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`, created with
:meth:`~MotorClient.start_session`.
- `**kwargs` (optional): additional arguments to the
`map reduce command`_ may be passed as keyword arguments to this
helper method, e.g.::
result = await db.test.map_reduce(map, reduce, "myresults", limit=2)
Returns a Future.
.. note:: The :meth:`map_reduce` method does **not** obey the
:attr:`read_preference` of this :class:`MotorCollection`. To run
mapReduce on a secondary use the :meth:`inline_map_reduce`
method instead.
.. _map reduce command: https://mongodb.com/docs/manual/reference/command/mapReduce/
.. mongodoc:: mapreduce
.. versionchanged:: 1.2
Added session parameter.
"""
replace_one_doc = """Replace a single document matching the filter.
Say our collection has one document::
{'x': 1, '_id': ObjectId('54f4c5befba5220aa4d6dee7')}
Then to replace it with another::
async def_replace_x_with_y():
result = await db.test.replace_one({'x': 1}, {'y': 1})
print('matched %d, modified %d' %
(result.matched_count, result.modified_count))
print('collection:')
async for doc in db.test.find():
print(doc)
This prints::
matched 1, modified 1
collection:
{'y': 1, '_id': ObjectId('54f4c5befba5220aa4d6dee7')}
The *upsert* option can be used to insert a new document if a matching
document does not exist::
async def_replace_or_upsert():
result = await db.test.replace_one({'x': 1}, {'x': 1}, True)
print('matched %d, modified %d, upserted_id %r' %
(result.matched_count, result.modified_count, result.upserted_id))
print('collection:')
async for doc in db.test.find():
print(doc)
This prints::
matched 1, modified 1, upserted_id ObjectId('54f11e5c8891e756a6e1abd4')
collection:
{'y': 1, '_id': ObjectId('54f4c5befba5220aa4d6dee7')}
: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`.
- `hint` (optional): An index to use to support the query
predicate specified either by its string name, or in the same
format as passed to
:meth:`~MotorDatabase.create_index` (e.g. ``[('field', ASCENDING)]``).
This option is only supported on MongoDB 4.2 and above.
- `session` (optional): a
:class:`~pymongo.client_session.ClientSession`, created with
:meth:`~MotorClient.start_session`.
- `comment` (optional): A user-provided comment to attach to this command.
:Returns:
- An instance of :class:`~pymongo.results.UpdateResult`.
.. note:: `bypass_document_validation` requires server version
**>= 3.2**
.. versionchanged:: 3.0
Added ``comment`` parameter.
.. versionchanged:: 2.2
Added ``hint`` parameter.
.. versionchanged:: 1.2
Added ``session`` parameter.
"""
update_many_doc = """Update one or more documents that match the filter.
Say our collection has 3 documents::
{'x': 1, '_id': 0}
{'x': 1, '_id': 1}
{'x': 1, '_id': 2}
We can add 3 to each "x" field::
async def add_3_to_x():
result = await db.test.update_many({'x': 1}, {'$inc': {'x': 3}})
print('matched %d, modified %d' %
(result.matched_count, result.modified_count))
print('collection:')
async for doc in db.test.find():
print(doc)
This prints::
matched 3, modified 3
collection:
{'x': 4, '_id': 0}
{'x': 4, '_id': 1}
{'x': 4, '_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`.
- `array_filters` (optional): A list of filters specifying which
array elements an update should apply. Requires MongoDB 3.6+.
- `hint` (optional): An index to use to support the query
predicate specified either by its string name, or in the same
format as passed to
:meth:`~MotorDatabase.create_index` (e.g. ``[('field', ASCENDING)]``).
This option is only supported on MongoDB 4.2 and above.
- `session` (optional): a
:class:`~pymongo.client_session.ClientSession`, created with
:meth:`~MotorClient.start_session`.
- `comment` (optional): A user-provided comment to attach to this command.
:Returns:
- An instance of :class:`~pymongo.results.UpdateResult`.
.. note:: `bypass_document_validation` requires server version
**>= 3.2**
.. versionchanged:: 3.0
Added ``comment`` parameter.
.. versionchanged:: 2.2
Added ``hint`` parameter.
.. versionchanged:: 1.2
Added ``array_filters`` and ``session`` parameters.
"""
update_one_doc = """Update a single document matching the filter.
Say our collection has 3 documents::
{'x': 1, '_id': 0}
{'x': 1, '_id': 1}
{'x': 1, '_id': 2}
We can add 3 to the "x" field of one of the documents::
async def add_3_to_x():
result = await db.test.update_one({'x': 1}, {'$inc': {'x': 3}})
print('matched %d, modified %d' %
(result.matched_count, result.modified_count))
print('collection:')
async for doc in db.test.find():
print(doc)
This prints::
matched 1, modified 1
collection:
{'x': 4, '_id': 0}
{'x': 1, '_id': 1}
{'x': 1, '_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`.
- `array_filters` (optional): A list of filters specifying which
array elements an update should apply. Requires MongoDB 3.6+.