queryset.py 文件源码

def get(self, id=None, callback=None, alias=None, **kwargs):
        '''
        Gets a single item of the current queryset collection using it's id.

        In order to query a different database, please specify the `alias` of the database to query.
        '''

        from motorengine import Q

        if id is None and not kwargs:
            raise RuntimeError("Either an id or a filter must be provided to get")

        if id is not None:
            if not isinstance(id, ObjectId):
                id = ObjectId(id)

            filters = {
                "_id": id
            }
        else:
            filters = Q(**kwargs)
            filters = self.get_query_from_filters(filters)

        self.coll(alias).find_one(filters, callback=self.handle_get(callback))