def put(self, **kwargs):
    is_update = self.is_saved()
    key = super(Feature, self).put(**kwargs)
    self.__notify_feature_subscribers_of_changes(is_update)
    return key
def put(self, **kwargs):
    is_update = self.is_saved()
    key = super(Feature, self).put(**kwargs)
    self.__notify_feature_subscribers_of_changes(is_update)
    return key