OpenQuizz
Une application de gestion des contenus pédagogiques
GridFS Class Reference
Inheritance diagram for GridFS:
Collaboration diagram for GridFS:

Public Member Functions

def __init__ (self, database, collection="fs", disable_md5=False)
 
def new_file (self, **kwargs)
 
def put (self, data, **kwargs)
 
def get (self, file_id, session=None)
 
def get_version (self, filename=None, version=-1, session=None, **kwargs)
 
def get_last_version (self, filename=None, session=None, **kwargs)
 
def delete (self, file_id, session=None)
 
def list (self, session=None)
 
def find_one (self, filter=None, session=None, *args, **kwargs)
 
def find (self, *args, **kwargs)
 
def exists (self, document_or_id=None, session=None, **kwargs)
 

Detailed Description

An instance of GridFS on top of a single Database.

Constructor & Destructor Documentation

◆ __init__()

def __init__ (   self,
  database,
  collection = "fs",
  disable_md5 = False 
)
Create a new instance of :class:`GridFS`.

Raises :class:`TypeError` if `database` is not an instance of
:class:`~pymongo.database.Database`.

:Parameters:
  - `database`: database to use
  - `collection` (optional): root collection to use
  - `disable_md5` (optional): When True, MD5 checksums will not be
    computed for uploaded files. Useful in environments where MD5
    cannot be used for regulatory or other reasons. Defaults to False.

.. versionchanged:: 3.11
   Running a GridFS operation in a transaction now always raises an
   error. GridFS does not support multi-document transactions.

.. versionchanged:: 3.1
   Indexes are only ensured on the first write to the DB.

.. versionchanged:: 3.0
   `database` must use an acknowledged
   :attr:`~pymongo.database.Database.write_concern`

.. mongodoc:: gridfs

Member Function Documentation

◆ delete()

def delete (   self,
  file_id,
  session = None 
)
Delete a file from GridFS by ``"_id"``.

Deletes all data belonging to the file with ``"_id"``:
`file_id`.

.. warning:: Any processes/threads reading from the file while
   this method is executing will likely see an invalid/corrupt
   file. Care should be taken to avoid concurrent reads to a file
   while it is being deleted.

.. note:: Deletes of non-existent files are considered successful
   since the end result is the same: no file with that _id remains.

:Parameters:
  - `file_id`: ``"_id"`` of the file to delete
  - `session` (optional): a
    :class:`~pymongo.client_session.ClientSession`

.. versionchanged:: 3.6
   Added ``session`` parameter.

.. versionchanged:: 3.1
   ``delete`` no longer ensures indexes.

◆ exists()

def exists (   self,
  document_or_id = None,
  session = None,
**  kwargs 
)
Check if a file exists in this instance of :class:`GridFS`.

The file to check for can be specified by the value of its
``_id`` key, or by passing in a query document. A query
document can be passed in as dictionary, or by using keyword
arguments. Thus, the following three calls are equivalent:

>>> fs.exists(file_id)
>>> fs.exists({"_id": file_id})
>>> fs.exists(_id=file_id)

As are the following two calls:

>>> fs.exists({"filename": "mike.txt"})
>>> fs.exists(filename="mike.txt")

And the following two:

>>> fs.exists({"foo": {"$gt": 12}})
>>> fs.exists(foo={"$gt": 12})

Returns ``True`` if a matching file exists, ``False``
otherwise. Calls to :meth:`exists` will not automatically
create appropriate indexes; application developers should be
sure to create indexes if needed and as appropriate.

:Parameters:
  - `document_or_id` (optional): query document, or _id of the
    document to check for
  - `session` (optional): a
    :class:`~pymongo.client_session.ClientSession`
  - `**kwargs` (optional): keyword arguments are used as a
    query document, if they're present.

.. versionchanged:: 3.6
   Added ``session`` parameter.

◆ find()

def find (   self,
args,
**  kwargs 
)
Query GridFS for files.

Returns a cursor that iterates across files matching
arbitrary queries on the files collection. Can be combined
with other modifiers for additional control. For example::

  for grid_out in fs.find({"filename": "lisa.txt"},
                  no_cursor_timeout=True):
      data = grid_out.read()

would iterate through all versions of "lisa.txt" stored in GridFS.
Note that setting no_cursor_timeout to True may be important to
prevent the cursor from timing out during long multi-file processing
work.

As another example, the call::

  most_recent_three = fs.find().sort("uploadDate", -1).limit(3)

would return a cursor to the three most recently uploaded files
in GridFS.

Follows a similar interface to
:meth:`~pymongo.collection.Collection.find`
in :class:`~pymongo.collection.Collection`.

If a :class:`~pymongo.client_session.ClientSession` is passed to
:meth:`find`, all returned :class:`~gridfs.grid_file.GridOut` instances
are associated with that session.

:Parameters:
  - `filter` (optional): a SON object specifying elements which
    must be present for a document to be included in the
    result set
  - `skip` (optional): the number of files 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.
  - `sort` (optional): a list of (key, direction) pairs
    specifying the sort order for this query. See
    :meth:`~pymongo.cursor.Cursor.sort` for details.

Raises :class:`TypeError` if any of the arguments are of
improper type. Returns an instance of
:class:`~gridfs.grid_file.GridOutCursor`
corresponding to this query.

.. versionchanged:: 3.0
   Removed the read_preference, tag_sets, and
   secondary_acceptable_latency_ms options.
.. versionadded:: 2.7
.. mongodoc:: find

◆ find_one()

def find_one (   self,
  filter = None,
  session = None,
args,
**  kwargs 
)
Get a single file from gridfs.

All arguments to :meth:`find` are also valid arguments for
:meth:`find_one`, although any `limit` argument will be
ignored. Returns a single :class:`~gridfs.grid_file.GridOut`,
or ``None`` if no matching file is found. For example::

    file = fs.find_one({"filename": "lisa.txt"})

:Parameters:
  - `filter` (optional): a dictionary specifying
    the query to be performing OR any other type to be used as
    the value for a query for ``"_id"`` in the file collection.
  - `*args` (optional): any additional positional arguments are
    the same as the arguments to :meth:`find`.
  - `session` (optional): a
    :class:`~pymongo.client_session.ClientSession`
  - `**kwargs` (optional): any additional keyword arguments
    are the same as the arguments to :meth:`find`.

.. versionchanged:: 3.6
   Added ``session`` parameter.

◆ get()

def get (   self,
  file_id,
  session = None 
)
Get a file from GridFS by ``"_id"``.

Returns an instance of :class:`~gridfs.grid_file.GridOut`,
which provides a file-like interface for reading.

:Parameters:
  - `file_id`: ``"_id"`` of the file to get
  - `session` (optional): a
    :class:`~pymongo.client_session.ClientSession`

.. versionchanged:: 3.6
   Added ``session`` parameter.

◆ get_last_version()

def get_last_version (   self,
  filename = None,
  session = None,
**  kwargs 
)
Get the most recent version of a file in GridFS by ``"filename"``
or metadata fields.

Equivalent to calling :meth:`get_version` with the default
`version` (``-1``).

:Parameters:
  - `filename`: ``"filename"`` of the file to get, or `None`
  - `session` (optional): a
    :class:`~pymongo.client_session.ClientSession`
  - `**kwargs` (optional): find files by custom metadata.

.. versionchanged:: 3.6
   Added ``session`` parameter.

◆ get_version()

def get_version (   self,
  filename = None,
  version = -1,
  session = None,
**  kwargs 
)
Get a file from GridFS by ``"filename"`` or metadata fields.

Returns a version of the file in GridFS whose filename matches
`filename` and whose metadata fields match the supplied keyword
arguments, as an instance of :class:`~gridfs.grid_file.GridOut`.

Version numbering is a convenience atop the GridFS API provided
by MongoDB. If more than one file matches the query (either by
`filename` alone, by metadata fields, or by a combination of
both), then version ``-1`` will be the most recently uploaded
matching file, ``-2`` the second most recently
uploaded, etc. Version ``0`` will be the first version
uploaded, ``1`` the second version, etc. So if three versions
have been uploaded, then version ``0`` is the same as version
``-3``, version ``1`` is the same as version ``-2``, and
version ``2`` is the same as version ``-1``.

Raises :class:`~gridfs.errors.NoFile` if no such version of
that file exists.

:Parameters:
  - `filename`: ``"filename"`` of the file to get, or `None`
  - `version` (optional): version of the file to get (defaults
    to -1, the most recent version uploaded)
  - `session` (optional): a
    :class:`~pymongo.client_session.ClientSession`
  - `**kwargs` (optional): find files by custom metadata.

.. versionchanged:: 3.6
   Added ``session`` parameter.

.. versionchanged:: 3.1
   ``get_version`` no longer ensures indexes.

◆ list()

def list (   self,
  session = None 
)
List the names of all files stored in this instance of
:class:`GridFS`.

:Parameters:
  - `session` (optional): a
    :class:`~pymongo.client_session.ClientSession`

.. versionchanged:: 3.6
   Added ``session`` parameter.

.. versionchanged:: 3.1
   ``list`` no longer ensures indexes.

◆ new_file()

def new_file (   self,
**  kwargs 
)
Create a new file in GridFS.

Returns a new :class:`~gridfs.grid_file.GridIn` instance to
which data can be written. Any keyword arguments will be
passed through to :meth:`~gridfs.grid_file.GridIn`.

If the ``"_id"`` of the file is manually specified, it must
not already exist in GridFS. Otherwise
:class:`~gridfs.errors.FileExists` is raised.

:Parameters:
  - `**kwargs` (optional): keyword arguments for file creation

◆ put()

def put (   self,
  data,
**  kwargs 
)
Put data in GridFS as a new file.

Equivalent to doing::

  try:
      f = new_file(**kwargs)
      f.write(data)
  finally:
      f.close()

`data` can be either an instance of :class:`str` (:class:`bytes`
in python 3) or a file-like object providing a :meth:`read` method.
If an `encoding` keyword argument is passed, `data` can also be a
:class:`unicode` (:class:`str` in python 3) instance, which will
be encoded as `encoding` before being written. Any keyword arguments
will be passed through to the created file - see
:meth:`~gridfs.grid_file.GridIn` for possible arguments. Returns the
``"_id"`` of the created file.

If the ``"_id"`` of the file is manually specified, it must
not already exist in GridFS. Otherwise
:class:`~gridfs.errors.FileExists` is raised.

:Parameters:
  - `data`: data to be written as a file.
  - `**kwargs` (optional): keyword arguments for file creation

.. versionchanged:: 3.0
   w=0 writes to GridFS are now prohibited.

The documentation for this class was generated from the following file: