Question

简单的代码不起作用！我一直在使用if语句获取错误尝试获取非对象属性。我尝试像数组一样访问它，我得到一条消息，说它无法作为数组访问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_can的print_r，var_dump和dd给出了这个：

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_can-＆gt;设置;返回错误尝试获取非对象的属性

使用$ setting = $ group_can ['setting'];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：

at HandleExceptions-＆gt; handleError（8，'试图获取非对象的属性'，'/ home / mwsubmissions/public_html/jon/MWSubmissionManager/app/User.php'，91，array（'perm'= ＆gt;'manage.projects'，'cando'=＆gt; 1，'groups'=＆gt; object（Collection），'permission'=＆gt; object（stdClass），'mygroup'=＆gt; object（stdClass），' group'=＆gt; null，'group_can'=＆gt; null，'setting'=＆gt; 1））

修改我删除了我遇到错误的代码的第一部分，然后得到了这个，同样的事情的另一个例子，但使用一个较小的对象，这一行比上一个更重要。所有细节都已更新。

Answer 1

最好检查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;
           }
        }
    }
     }

Answer 2

您尝试访问的属性是数组“属性”的元素，因此请尝试：

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;
       }
    }
 }

希望这会有所帮助：）

Answer 3

首先，确保在组模型中将“project_id”添加到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; } } }数组中试试这个

<ListView x:Name="myListView" ItemsSource="{Binding players}" HorizontalOptions="FillAndExpand" > 
      <ListView.ItemTemplate>
             <DataTemplate>
                   <ViewCell>
                       <Grid>                                                            
                           <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*"/>                                                                                              
                                <ColumnDefinition Width="*"/>
                                 ...                                                                                                                                                                                 
                           </Grid.ColumnDefinitions>
                           <Button Grid.Column="0" Text="{Binding Status, Converter={StaticResource StatusToTextConverter}, Mode=TwoWay}" HorizontalOptions="CenterAndExpand"/>
                           <Button Grid.Column="1" Text="{Binding Status, Converter={StaticResource StatusToTextExConverter}, Mode=TwoWay}" HorizontalOptions="CenterAndExpand"/>
                           ...
                       </Grid>
                   </ViewCell>
             </DataTemplate>
      </ListView.ItemTemplate>

Laravel试图在对象中获取非对象的属性

3 个答案: