protected function callback_after_get($result)
 {
     $this->load->model('Blog_tag_model', 'tags');
     $result = parent::callback_after_get($result);
     $result->tags = $this->tags->get_by_post_id($result->id);
     return $result;
 }
 protected function callback_after_get($result)
 {
     $result = parent::callback_after_get($result);
     return $result;
 }