/**
  * 
  * 保存添加的话题
  */
 public function doaddAction()
 {
     $tag = $this->getInput('tag');
     if (!$tag['name']) {
         $this->showError('Tag:tagname.empty');
     }
     if ($this->_getTagDs()->getTagByName($tag['name'])) {
         $this->showError("话题{$tag['name']}已存在");
     }
     $tag = $this->getInput('tag');
     $logo = $this->uploadLogo();
     $dm = new PwTagDm();
     $dm->setName($tag['name'])->setTagLogo($logo)->setTypeId(PwTag::TYPE_THREAD_TOPIC)->setIfhot(1)->setCreateUid($this->loginUser->uid)->setExcerpt($tag['excerpt'])->setSeoTitle($tag['seo_title'])->setSeoDescript($tag['seo_description'])->setSeoKeywords($tag['seo_keywords']);
     $logo && $dm->setIflogo(1);
     if (is_numeric($tagId = $this->_getTagDs()->addTag($dm))) {
         // 话题内容关系
         $tag['category'] && $this->_getTagCateGoryDs()->addCategoryRelations($tagId, $tag['category']);
         //关联话题
         if ($tag['relate_tags']) {
             $tagNames = explode(',', $tag['relate_tags']);
             foreach ($tagNames as $v) {
                 $this->_addRelateTag($tagId, $v);
             }
         }
         $this->_deleteHotTagCache();
         $this->showMessage('话题添加成功!');
     } else {
         if ($tagId instanceof PwError) {
             $this->showError($tagId->getError());
         }
         $this->showError('话题添加失败!');
     }
 }