public function authorize()
 {
 return false;
 }
 
 public function rules()
 {
 return [
  //
 ];
 }

 public function authorize()
 {
 //修改为 true，表示不需要认证，或者是通过认证
 return true;
 }
 
 public function rules()
 {
 return [
  'title' => 'required|min:3',
    'body' => 'required',
    'published_at' => 'required|date'
 ];
 }

  @if ($errors->any())
    <ul class="alert alert-danger">
      @foreach($errors->all() as $error)
        <li>{{ $error }}</li>
      @endforeach
    </ul>
  @endif
  
  {{--使用我们添加的 illuminate\html 开源库--}}
  {!! Form::open(['url' => 'articles']) !!}

  public function store(Requests\CreateArticleRequest $request) {
    Article::create($request->all());

    return redirect('articles');
  }

 "min"         => [
 "numeric" => "The :attribute must be at least :min.",
 "file"  => "The :attribute must be at least :min kilobytes.",
 "string" => ":attribute 至少要包含 :min 字符。",
 "array"  => "The :attribute must have at least :min items.",
 ],
 
 "required"       => ":attribute 必须填写。",

 //注意 Request 的命名空间，不要弄错了
  public function store(\Illuminate\Http\Request $request) {

    $this->validate($request, [
      'title' => 'required|min:3',
      'body' => 'required',
      'published_at' => 'required|date'
    ]);

    Article::create($request->all());

    return redirect('articles');
  }