/**
  * @param $tag
  * @return bool
  */
 public static function addId($tag)
 {
     $post = CommentPost::find($tag->getAttribute('id'));
     if ($post) {
         $tag->setAttribute('discussionid', (int) $post->discussion_id);
         $tag->setAttribute('number', (int) $post->number);
         return true;
     }
 }