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当用户没有跟随者时尝试获取非对象错误的属性

laravel php

BARNOWL · 技术社区 · 6 年前

每当我转到用户配置文件页,并且用户没有关注者时,就会出现以下错误。 我在用 laravel follow

试图获取非对象的属性 $user->关注者->获取();

当用户有关注者时,它会显示没有错误的关注者。

myfollow.php文件

class MyFollow extends Model
{
    use SoftDeletes, CanFollow, CanBeFollowed;

    protected $fillable = [
        'user_id',
        'followable_id'
    ];

    public $timestamps = false;

    protected $table = 'followables';

    public function followers()
    {
        $user = User::find($this->user_id); 

        $user->followers->get();


    }



}

usercontroller.php用户控制器

public function getProfile($user)
{  
        $user = User::with(['posts.likes' => function($query) {
                            $query->whereNull('deleted_at');
                        }])
                      ->where('name','=', $user)

                      ->with(['follow' => function($query) {

                            $query->with('followers');

                       }])->first();


        if(!$user){
            return redirect('404');
        }

        return view ('profile')->withUser($user);
}

profile.blade.php文件

            @foreach($user->followers as $use)
                    @isset($use->name)
                    <ul>

                        <li>{{$use->name}}</li>
                     @endisset
                    </ul>



            @endforeach

user.php用户

  public function follow()
    {   
        return $this->hasMany('App\MyFollow');
    }

2 回复 | 直到 6 年前

rkj 6 年前

MyFollow模型

class MyFollow extends Model
{
    use SoftDeletes, CanFollow, CanBeFollowed;

    protected $fillable = [
        'user_id',
        'followable_id'
    ];

    public $timestamps = false;

    protected $table = 'followables';

    public function follower()
    {
        return $this->belongsTo('App\User', 'followable_id');
    }
}

控制器变更

public function getProfile($user)
{  
        $user = User::with(['posts.likes' => function($query) {
                            $query->whereNull('deleted_at');
                        }, 'follow','follow.follower'])
                      ->where('name','=', $user)->first();


        if(!$user){
            return redirect('404');
        }

        return view ('profile')->with('user', $user);
}

查看

@foreach($user->follow as $follow)
     <ul>
        @if($follow->follower)
           <li>{{$follow->follower->name}}</li>
        @endif
    </ul>
@endforeach

mankowitz 6 年前

所以,在返回一个值之前,只需要做一个健全的检查。

public function followers()
{
    $user = User::find($this->user_id); 
    if ($user->followers) 
    { 
        return $user->followers->get(); 
    } else {  
        return "No Followers"; 
    }
}

根据追随者的构成方式,您可能需要 $user->followers->count()