无法在 z-song laravel-admin 中使级联选择



Laravel版本:5.8

拉拉维尔管理员:1.7.9

我无法进行级联选择

我有表格:

用户:ID、名称

分类: ID, 姓名

categories_users:ID、categories_id、user_id

模型:

class User extends Authenticatable {
public function category()
{
return $this->belongsToMany(Categories::class, 'categories_users', 'categories_id');
}
}

class Categories extends Model {
public function users()
{
return $this->belongsToMany(User::class, 'categories_users');
}
}

我需要级联选择:

$form->select('user_id', 'User')->options($seller)->load('categories_id', '/admin/api/users')->required();
$form->select('categories_id', 'Categories of user')->required();

但它不起作用!!

控制器:

public function getData(Request $request){
$user_id = $request->get('q');
return User::find($user_id)->category()->get(['id', DB::raw('name as text')]);
}
public function getData(Request $request){
$user_id = $request->get('q');
$q = DB::table('categories_users')->where('user_id', $user_id)->pluck('categories_id');
$categories = Categories::whereIn('id', $q)->get(['id', DB::raw('name as text')]);
return $categories;
}

它有效!

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