【发布时间】：2020-10-09 14:54:43
【问题描述】：
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...
我想要什么：
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。还有ArticlebelongsToCategory。
类别-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。例如，当我在category 上单击Category 1 选择时，在article 上选择它应该只显示Article 1, Article 2 and Article 3。
我做了什么
我遵循了 Backpack 文档中的说明，在此 link 上为 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Category 模型，这是Article 模型：
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。所以当我创建Article 时，它会显示我的标题，我必须从category select 中选择category_id。
毕竟我做了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 模特：
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 的指示进行操作。
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');
}
来自backpack docs。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 复制粘贴代码，但当然我根据需要更改了模型。
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');
我将这些路由复制粘贴到我的web.php 中的routes 文件夹和custom.php 中的routes/backpack 文件夹中。
但是当我在Archive create 中选择类别时，没有articles 显示。
有人可以帮我解决这个问题吗？
【问题讨论】：
标签： php json ajax laravel laravel-backpack