/**
  * 
  * 设置热门话题
  */
 public function sethotAction()
 {
     $tagIds = $this->getInput('tag_id');
     if (!$tagIds) {
         $this->showError('operate.select');
     }
     $time = Pw::getTime();
     foreach ($tagIds as $tagId) {
         $dm = new PwTagDm($tagId);
         $dm->setIfhot(1);
         $this->_getTagDs()->updateTag($dm);
         $this->_getTagDs()->addTagRecord($tagId, $time);
     }
     //删除update表
     $this->_deleteHotTagCache();
     $this->showMessage('ADMIN:success');
 }