试图获得非对象的属性 - Laravel 5

我试图在我的文章中回显用户的名称，我得到了

错误异常：尝试获取非对象的属性

我的代码：

模型

1. News

    class News extends Model
    {
      public function postedBy()
      {
         return $this->belongsTo('App\User');
      }
      protected $table = 'news';
      protected $fillable = ['newsContent', 'newsTitle', 'postedBy'];
    }

2. User

    class User extends Model implements AuthenticatableContract,
                                AuthorizableContract,
                                CanResetPasswordContract
    {
        use Authenticatable, Authorizable, CanResetPassword;

        protected $table = 'users';

        protected $fillable = ['name', 'email', 'password'];

        protected $hidden = ['password', 'remember_token'];

    }

图式

桌子users

桌子news

控制器

public function showArticle($slug)
    {
        $article = News::where('slug', $slug)->firstOrFail();
        return view('article', compact('article'));
    }

叶片

{{ $article->postedBy->name }}

当我尝试删除边栏选项卡中的名称时，它会输出 ，但是当我尝试添加 ->name 时，它会显示 nameUser' 模型。我错过了什么吗？{{ $article->postedBy }}idTrying to get property of non-object but I have a field in my table and a