/**
  * 注册帖子列表接口通用的引入项.
  */
 protected function registerListApiIncludes()
 {
     $this->topics->addAvailableInclude('user', ['name', 'avatar']);
     $this->topics->addAvailableInclude('last_reply_user', ['name']);
     $this->topics->addAvailableInclude('node', ['name']);
 }