Laravel雄辩/许多关系给出错误(数组到字符串转换)

Question

我想显示用户申请的所有职务帖子。

这是我的桌子..。

applies   ->  | users_id | posts_id |
posts     ->  | id       | (other posts cols ... )
user_info ->  | id       | (name col etc...)

我尝试过belongsToMany()，但给出了错误

mb_strpos()：参数#1 ($haystack)必须是字符串类型，数组给定

Post模型关系

public function applies()
{
   return $this->belongsToMany(Applies::class ,'applies', 'users_id' , 'posts_id');
}

应用模型

   protected $table = 'applies';
    protected $primaryKey = ['user_id', 'id'];
    public $incrementing = false;
    protected $fillable = [
        'user_id',
        'posts_id'
    ];

最后控制器

public function index()
{
    $infos = Info::where('user_id', Auth::id())->first();
    $apply = Post::find(2)->applies ;
    var_dump($apply);
}

Answer 1

必须将枢轴表名作为第二个参数传递给belongsToMany。

 return $this->belongsToMany(User::class ,'applies', 'users_id' , 'posts_id');

如果将实现方法.second参数视为表名

  public function belongsToMany($related, $table = null, $foreignPivotKey = null, $relatedPivotKey = null,
                                  $parentKey = null, $relatedKey = null, $relation = null)