__init__.py 文件源码

def make_directed_ndb_query(self, kind_class, keys_only=False):
    """Construct an NDB query for this key range, including the scan direction.

    Args:
      kind_class: An ndb.Model subclass.
      keys_only: bool, default False, use keys_only on Query?

    Returns:
      An ndb.Query instance.

    Raises:
      KeyRangeError: if self.direction is not in (KeyRange.ASC, KeyRange.DESC).
    """
    assert issubclass(kind_class, ndb.Model)
    if keys_only:
      default_options = ndb.QueryOptions(keys_only=True)
    else:
      default_options = None
    query = kind_class.query(app=self._app,
                             namespace=self.namespace,
                             default_options=default_options)
    query = self.filter_ndb_query(query)
    if self.__get_direction(True, False):
      query = query.order(kind_class._key)
    else:
      query = query.order(-kind_class._key)
    return query