Laravel - 背包 select 依赖于另一个 select

Question

我最近在我的 Laravel 项目中安装了Laravel Backpack admin。 目前我正在努力。 但我需要帮助。 所以...

我想要的是：

我想要两个选择，第一个是Category ，第二个是Article 。 所以Article select 必须依赖于Category select。 并且Article belongsTo Category 。

分类-文章

Category 1 = [ Article 1, Article 2, Article 3 ]
Category 2 = [ Article 4, Article 5 ]

这只是显示哪个文章属于类别。 因此，例如，当我在article select 上单击category select 上的Category 1时，它应该只显示Article 1, Article 2 and Article 3 。

我做了什么

我按照 Backpack docs 上的说明添加了一个依赖于此链接Add a select2 field that depends on another field 。 所以我首先做了什么：

我创建了两个表， Category表和Article表。 他们的模型：

class Category extends Model
{
    use CrudTrait;

    /*
    |--------------------------------------------------------------------------
    | GLOBAL VARIABLES
    |--------------------------------------------------------------------------
    */

    protected $table = 'categories';
    protected $primaryKey = 'id';
    // public $timestamps = false;
    // protected $guarded = ['id'];
    protected $fillable = ['title'];
    // protected $hidden = [];
    // protected $dates = [];

    /*
    |--------------------------------------------------------------------------
    | FUNCTIONS
    |--------------------------------------------------------------------------
    */

    public function articles(){
        return $this->hasMany('App\Models\Article');
    }
}

这是一个Category model，这是Article model：

class Article extends Model
{
    use CrudTrait;

    /*
    |--------------------------------------------------------------------------
    | GLOBAL VARIABLES
    |--------------------------------------------------------------------------
    */

    protected $table = 'articles';
    protected $primaryKey = 'id';
    // public $timestamps = false;
    // protected $guarded = ['id'];
    protected $fillable = ['title', 'category_id'];
    // protected $hidden = [];
    // protected $dates = [];

    /*
    |--------------------------------------------------------------------------
    | FUNCTIONS
    |--------------------------------------------------------------------------
    */

    /*
    |--------------------------------------------------------------------------
    | RELATIONS
    |--------------------------------------------------------------------------
    */

    public function category(){
        return $this->belongsTo('App\Models\Category');
    }
}

我在这两个模型之间建立了这样的关系。 因此，当我创建Article时，它会显示标题，我必须从category select中选择category_id 。

毕竟，我制作了Archive表，这些是我的迁移：

Schema::create('archives', function (Blueprint $table) {
   $table->increments('id');
   $table->string('title');

   $table->bigInteger('category_id')->unsigned();
   $table->foreign('category_id')->references('id')->on('categories');

   $table->bigInteger('article_id')->unsigned();
   $table->foreign('article_id')->references('id')->on('articles');

   $table->timestamps();
});

还有我的Archive.php model：

class Archive extends Model
{
    use CrudTrait;

    /*
    |--------------------------------------------------------------------------
    | GLOBAL VARIABLES
    |--------------------------------------------------------------------------
    */

    protected $table = 'archives';
    protected $primaryKey = 'id';
    // public $timestamps = false;
    // protected $guarded = ['id'];
    protected $fillable = ['title', 'category', 'article'];
    // protected $hidden = [];
    // protected $dates = [];

    /*
    |--------------------------------------------------------------------------
    | FUNCTIONS
    |--------------------------------------------------------------------------
    */

    /*
    |--------------------------------------------------------------------------
    | RELATIONS
    |--------------------------------------------------------------------------
    */

    public function category(){
        return $this->belongsTo('App\Models\Category');
    }

    public function article(){
        return $this->belongsTo('App\Models\Article');
    }
}

然后我按照backpack docs的说明进行操作。 这是我的ArchiveCrudController ：

public function setup()
    {
        /*
        |--------------------------------------------------------------------------
        | CrudPanel Basic Information
        |--------------------------------------------------------------------------
        */
        $this->crud->setModel('App\Models\Archive');
        $this->crud->setRoute(config('backpack.base.route_prefix') . '/archive');
        $this->crud->setEntityNameStrings('archive', 'archives');

        $this->crud->setColumns(['title', 'category', 'article']);
        $this->crud->addField([
            'name' => 'title',
            'type' => 'text',
            'label' => "Archive title"
        ]);

        $this->crud->addField([    // SELECT2
            'label'         => 'Category',
            'type'          => 'select',
            'name'          => 'category_id',
            'entity'        => 'category',
            'attribute'     => 'title',
        ]);
        $this->crud->addField([ // select2_from_ajax: 1-n relationship
            'label'                => "Article", // Table column heading
            'type'                 => 'select2_from_ajax',
            'name'                 => 'article_id', // the column that contains the ID of that connected entity;
            'entity'               => 'article', // the method that defines the relationship in your Model
            'attribute'            => 'title', // foreign key attribute that is shown to user
            'data_source'          => url('api/article'), // url to controller search function (with /{id} should return model)
            'placeholder'          => 'Select an article', // placeholder for the select
            'minimum_input_length' => 0, // minimum characters to type before querying results
            'dependencies'         => ['category'], // when a dependency changes, this select2 is reset to null
            //'method'                    => ‘GET’, // optional - HTTP method to use for the AJAX call (GET, POST)
        ]);


        /*
        |--------------------------------------------------------------------------
        | CrudPanel Configuration
        |--------------------------------------------------------------------------
        */

        // TODO: remove setFromDb() and manually define Fields and Columns
        //$this->crud->setFromDb();

        // add asterisk for fields that are required in ArchiveRequest
        $this->crud->setRequiredFields(StoreRequest::class, 'create');
        $this->crud->setRequiredFields(UpdateRequest::class, 'edit');
    }

就像来自backpack docs一样。 然后我在App\Http\Controller中创建了Api文件夹，然后在其中创建了ArticleController ，如下所示：

<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Article;
use Illuminate\Http\Request;

class ArticleController extends Controller
{
    public function index(Request $request)
    {
        $search_term = $request->input('q');
        $form = collect($request->input('form'))->pluck('value', 'name');

        $options = Article::query();

        // if no category has been selected, show no options
        if (! $form['category']) {
            return [];
        }

        // if a category has been selected, only show articles in that category
        if ($form['category']) {
            $options = $options->where('category_id', $form['category']);
        }

        if ($search_term) {
            $results = $options->where('title', 'LIKE', '%'.$search_term.'%')->paginate(10);
        } else {
            $results = $options->paginate(10);
        }

        return $options->paginate(10);
    }

    public function show($id)
    {
        return Article::find($id);
    }
}

我只是从docs中复制粘贴代码，但当然我根据需要更改了 model。 最后是我的routes ：

Route::get('api/article', 'App\Http\Controllers\Api\ArticleController@index');
Route::get('api/article/{id}', 'App\Http\Controllers\Api\ArticleController@show');

我将这些路线复制粘贴到我的web.php的routes文件夹和custom.php的routes/backpack文件夹中。

但是当我在我的Archive create任何articles显示。 有人可以帮我吗？

Answer 1

从背包 4.1 开始，您应该在依赖字段上包含 'include_all_form_fields' => true 属性。

Answer 2

您的代码中有一些问题，我希望这可以解决它们：

1- 在 ArchiveCrudController 中：确保具有 category_id 的依赖项不是类别...

'dependencies'         => ['category_id'], 

 $this->crud->addField([ // select2_from_ajax: 1-n relationship
            'label'                => "Article", 
            'type'                 => 'select2_from_ajax',
            'name'                 => 'article_id',
            'entity'               => 'article',
            'attribute'            => 'title', 
            'data_source'          => url('api/article'), 
            'placeholder'          => 'Select an article',
            'minimum_input_length' => 0, querying results
            'dependencies'         => ['category_id'], 
            //'method'                    => ‘GET’,
        ]);

2-在存档 Model $fillable 应该采用 db 列名而不是关系...

 protected $fillable = ['title', 'category_id', 'article_id'];

3- 当你得到 $form 请求参数时，它带有名称 category_id 就像你在 Crud 中命名它不是（类别）

public function index(Request $request)
    {
        $search_term = $request->input('q');
        $form = collect($request->input('form'))->pluck('value', 'name');

        $options = Article::query();

        // if no category has been selected, show no options
        if (! $form['category_id']) {
            return [];
        }

        // if a category has been selected, only show articles in that category
        if ($form['category_id']) {
            $options = $options->where('category_id', $form['category_id']);
        }

        if ($search_term) {
            $results = $options->where('title', 'LIKE', '%'.$search_term.'%')->paginate(10);
        } else {
            $results = $options->paginate(10);
        }

        return $options->paginate(10);
    }