core.py 文件源码

def find(self, *args, **kwargs):
        """Create a :class:`MongoMotorAgnosticCursor`. Same parameters as for
        PyMongo's :meth:`~pymongo.collection.Collection.find`.

        Note that ``find`` does not take a `callback` parameter, nor does
        it return a Future, because ``find`` merely creates a
        :class:`MongoMotorAgnosticCursor` without performing any operations
        on the server.
        ``MongoMotorAgnosticCursor`` methods such as
        :meth:`~MongoMotorAgnosticCursor.to_list` or
        :meth:`~MongoMotorAgnosticCursor.count` perform actual operations.
        """
        if 'callback' in kwargs:
            raise pymongo.errors.InvalidOperation(
                "Pass a callback to each, to_list, or count, not to find.")

        cursor = self.delegate.find(*args, **kwargs)
        cursor_class = create_class_with_framework(
            MongoMotorAgnosticCursor, self._framework, self.__module__)

        return cursor_class(cursor, self)