/**
  * @param Model $obj
  * @return array
  */
 protected function do_create_array(Model $obj)
 {
     return array('post_id' => $obj->get_post_id(), 'meta_key' => '', 'meta_value' => serialize(array('message' => $obj->get_message(), 'code' => $obj->get_code(), 'level' => $obj->get_level())));
 }