core.py 文件源码

def get_by_urlsafe(self, urlsafe):
        """Returns an ndb.Model entity that the urlsafe key points to. Checks
        that the type of entity returned is of the correct kind. Raises an
        error if the key String is malformed or the entity is of the incorrect
        kind.
        :param urlsafe: A urlsafe key string
        """
        try:
            key = ndb.Key(urlsafe=urlsafe)
        except TypeError:
            raise endpoints.BadRequestException('Invalid Key')
        except Exception, e:
            if e.__class__.__name__ == 'ProtocolBufferDecodeError':
                raise endpoints.BadRequestException('Invalid Key')
            else:
                raise
        model = key.get()
        if not model:
            return None

        self._isinstance(model)

        return model