Method find_one

pymongo/synchronous/collection.py:1723–1756

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`

(
        self, filter: Optional[Any] = None, *args: Any, **kwargs: Any
    )

        )

    def find_one(
        self, filter: Optional[Any] = None, *args: Any, **kwargs: Any
    ) -> Optional[_DocumentType]:
        """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`.

        :param filter: a dictionary specifying
            the query to be performed OR any other type to be used as
            the value for a query for ``"_id"``.

        :param args: any additional positional arguments
            are the same as the arguments to :meth:`find`.

        :param kwargs: any additional keyword arguments
            are the same as the arguments to :meth:`find`.

            :: code-block: python

              >>> 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: Any, **kwargs: Any) -> Cursor[_DocumentType]:
        """Query the database.