我使用的文件：

<?php

namespace App\GraphQl\Query\User;

use App\GraphQl\Traits\UserTrait;
use App\Models\User;

use GraphQL\Type\Definition\ResolveInfo;
use Rebing\GraphQL\Support\Facades\GraphQL;
use GraphQL\Type\Definition\Type;
use Rebing\GraphQL\Support\Query;

GraphQl UserRolesQuery文件：

use Closure;

class UserRolesQuery extends Query
{
    use UserTrait;

    protected $attributes = [
        'name' => 'user',
    ];

    public function type(): Type
    {
        return GraphQL::type('UserType');
    }

    public function args(): array
    {
        return [
            'id' => [
                'name' => 'id',
                'type' => Type::int(),
//                'rules' => ['required'] validation
            ],

        ];
    }

    public function resolve($root, array $args, $context, ResolveInfo $resolveInfo, Closure $getSelectFields)
    {

希望返回用户角色名的Resolve函数

$user = User::find($args['id']);
        $result =  $user->getRoleNames();
        return $result;

    }

}

我希望$user->getRoleNames();返回用户角色名称..但它总是返回NULL