Laravel试图获取对象中非对象的属性

Question

简单的代码不起作用！我一直在用if语句获取行上非object的属性时出错。我尝试像数组一样访问它，但收到一条消息说它不能以数组的形式访问stdClass。

    public function isAllowed($perm)
    {
       $cando = 0;
       $groups = DB::table('group_user')->where('user_id', $this->id)->get();

       foreach ($groups as $mygroup)
       {
          $group_can = DB::table('group_permission')->where([
            ['permission_id', $permission->id],
            ['group_id', $mygroup->group_id]
          ])->first();

          $setting = $group_can->setting; // Error returns for this line // 

          if ($setting > $cando)
          {
            $cando = $setting;
          }
        }
     }

$group的print\u r、var\u dump和dd可以给出：

stdClass Object
(
    [group_id] => 1
    [permission_id] => 50
    [setting] => 1
)
object(stdClass)#555 (3) { ["group_id"]=> int(1) ["permission_id"]=> int(50) ["setting"]=> int(1) }
{#555 ▼
  +"group_id": 1
  +"permission_id": 50
  +"setting": 1
}

使用$setting=$group\u可以-

返回错误不能使用stdClass类型的对象作为数组

laravel错误的详细信息如下：

可处理的例外情况-

编辑我删除了第一部分出错的代码，然后得到了这个，另一个相同的例子，但是使用了一个更小的对象，这一行比最后一行更重要。所有详细信息已更新。

Answer 1

首先，确保您将project_id添加到组模型中的$fillable数组

public function isAllowed($perm)
{
  $cando = 0;
  $groups = DB::table('group_user')->where('user_id', $this->id)->get();

  foreach ($groups as $mygroup)
  {
      $group = Group::whereId($mygroup->group_id)->first();

      if (!is_null($group->attributes['project_id']))
      {
        continue;
      }
   }
}

Answer 2

您试图访问的属性是数组“attributes”的元素，请尝试：

public function isAllowed($perm)
{
   $cando = 0;
   $groups = DB::table('group_user')->where('user_id', $this->id)->get();

   foreach ($groups as $mygroup)
   {
      $group = Group::find($mygroup->group_id);

       if (!is_null($group->attributes['project_id']))
       {
          continue;
       }
    }
 }

希望这有帮助：）

Answer 3

最好你可以检查isset

public function isAllowed($perm)
    {
       $cando = 0;
       $groups = DB::table('group_user')->where('user_id', $this->id)->get();

    if(isset($groups)&&count($groups)>0){
       foreach ($groups as $mygroup)
       {

            if(isset($mygroup->group_id)){
          $group = Group::find($mygroup->group_id);
        }
           if (!is_null($group->project_id))
           {
              continue;
           }
        }
    }
     }