/**
  * Store a newly created resource in storage.
  *
  * @return Response
  */
 public function store(Request $request)
 {
     $this->validate($request, ['title' => 'required', 'description' => 'required', 'content' => 'required']);
     $article = Article::create($request->only(['title', 'description', 'content', 'category_id', 'keywords']));
     if ($article) {
         $this->clear_articels_cache();
         $message = "添加文章成功";
     } else {
         $message = "添加文章失败";
     }
     return redirect('/admin/article')->with('message', $message);
 }