ErrorException在CrudTrait.php未定义偏移量：0背包Laravel 5.2

我想创建从数据库动态组合框，但是我有一个错误此消息：ErrorException在CrudTrait.php未定义偏移量：0背包Laravel 5.2

ErrorException在CrudTrait.php线32：未定义偏移：0（查看：/home/vagrant/Code/hrd/resources/views/vendor/backpack/crud/fields/select2.blade.php）（查看：/ home/vagrant/Code/hrd/resources/views/vendor/backpack/crud /fields/select2.blade.php）（查看：/home/vagrant/Code/hrd/resources/views/vendor/backpack/crud/fields/select2.blade.php）

这是我的DistrictCrudController.php：

<?php 



namespace App\Http\Controllers\Admin; 

use Backpack\CRUD\app\Http\Controllers\CrudController; 

use App\Http\Requests\DistrictRequest as StoreRequest; 

use App\Http\Requests\DistrictRequest as UpdateRequest; 

class DistrictCrudController extends CrudController { 

    public function __construct() { 
     parent::__construct(); 

     $this->crud->setModel("App\Models\District"); 
     $this->crud->setRoute("admin/district"); 
     $this->crud->setEntityNameStrings('district', 'districts'); 
     $this->crud->setFromDb(); 

     $this->crud->addField([ 
           'label' => "City", 
           'type' => 'select2',// the method that defines the relationship in your Model 
           'name' => 'city_id', // the db column for the foreign key 
           'entity' => 'cities', //tabel entity 
           'attribute' => 'id', // foreign key attribute that is shown to user 
           'model' => "App\Models\City" // foreign key model 
          ]);     
    } 

    public function store(StoreRequest $request) 
    { 
     return parent::storeCrud(); 
    } 

    public function update(UpdateRequest $request) 
    { 
     return parent::updateCrud(); 
    } 
}

的代码运行好，如果我删除：

$this->crud->addField([ 
           'label' => "City", 
           'type' => 'select2',// the method that defines the relationship in your Model 
           'name' => 'city_id', // the db column for the foreign key 
           'entity' => 'cities', //tabel entity 
           'attribute' => 'id', // foreign key attribute that is shown to user 
           'model' => "App\Models\City" // foreign key model 
          ]);

我用背包Laravel 5.2

来源

2016-09-15 corfied

你好。为了调试这个，你可以去CrudTrait.php：32并复制粘贴代码吗？另外，你确定你的地区模特有“城市”关系吗？干杯! – tabacitu

不知道是否会解决，但我只可以看到，可能会导致这两个问题。

您没有定义城市的关系，或者你可以尝试使用：

public function setUp() 
    { 
$this->crud->setModel("App\Models\District"); 
     $this->crud->setRoute("admin/district"); 
     $this->crud->setEntityNameStrings('district', 'districts'); 
     $this->crud->setFromDb(); 
... 
...

不使用父:: __构造（）。

试试看，如果不解决，请发布您的结果。

来源

2017-01-25 10:34:55

ErrorException在CrudTrait.php未定义偏移量：0背包Laravel 5.2

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