def _GetTableConfigList(self):
    query = table_config.TableConfig.query()
    table_config_list = query.fetch(keys_only=True)
    return_list = []
    for config in table_config_list:
      return_list.append(config.id())
    self.response.out.write(json.dumps({
        'table_config_list': return_list,
    }))