Bug？Laravel 5.5 使用 API Resources 处理 Notifications 时的小疑问

• Laravel Version: 5.5
• PHP Version: PHP 7.1.7 (cli) (built: Jul 15 2017 18:08:09) ( NTS )
• Database Driver & Version: SQLite version 3.19.3 2017-06-27 16:48:08
• OS: macOS High Sierra 10.13.2

Description:

对Notifications使用 API Resources 时，发现了一个问题：

Model:

namespace App;

use Illuminate\Database\Eloquent\Model;
class Notification extends Model
{

    protected $table = 'notifications';

}

Resource:

namespace App\Http\Resources;

use Illuminate\Http\Resources\Json\ResourceCollection;

class SystemNotificationCollection extends ResourceCollection
{
    public function toArray($request)
    {
        return [
            'data' => $this->collection,
            'links' => [
                'self' => 'link-value',
            ],
        ];
    }
}

Controller:

public function index(Request $request)
    {
        return new SystemNotificationCollection( Notification::where('type', SystemNotification::class)->paginate());
    }

Database:

Result:

Transform:
e58f93d1-1c44-4271-8381-0f927b7bdda4 -> 0

20d91d78-0075-4e6e-b7db-ec8fabe1e130 -> 20

所以转换过程类似于 : (int)id ?

我在 Model中添加如下代码:

    public function getIdAttribute($value)
    {
        return $this->attributes['id'];
    }

问题得以解决:

所以，这是一个Bug么?