Question

我想从数据库创建动态组合框，但我对此消息有错误：

CrudTrait.php中的ErrorException第32行：未定义的偏移量：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();
    }
}

如果删除，代码运行良好：

$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
                            ]);

我使用Backpack for Laravel 5.2

Answer 1

不确定它是否会解决，但我只能看到可能导致这两个问题。

您没有定义城市关系，或者您可以尝试使用：

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

不要使用parent :: __ construct（）。

试一试，如果没有解决，请发布结果。

CrudTrait.php中的ErrorException未定义的偏移量：0为Laravel 5.2提供背包

1 个答案: