node.py 文件源码

def filter_by_ids(self, query, ids=None):
        """Filter `query` result set by system_id values.

        :param query: A QuerySet of Nodes.
        :type query: django.db.models.query.QuerySet_
        :param ids: Optional set of ids to filter by.  If given, nodes whose
            system_ids are not in `ids` will be ignored.
        :type param_ids: Sequence
        :return: A filtered version of `query`.

        .. _django.db.models.query.QuerySet: https://docs.djangoproject.com/
           en/dev/ref/models/querysets/

        """
        if ids is None:
            return query
        else:
            return query.filter(system_id__in=ids)