dingo/API 中 transformers 的正确使用姿势是怎样的？

按照文档中实现transformers的方法会报如下错误

{
    message: "Call to undefined method App\Transformers\UserTransformer::setCurrentScope()",
    status_code: 500,
    debug: {
    line: 406,
    ...

然后我在ｇｉｔｈｕｂ上找到了这种实现方式，则能正常转换

use App\User;
use Dingo\Api\Contract\Transformer\Adapter;
use Dingo\Api\Http\Request;
use Dingo\Api\Transformer\Binding;
use League\Fractal\TransformerAbstract;

class UserTransformer extends TransformerAbstract
{

    public function transform(User $user)
    {
        return [
            'id'            => (int) $user->id,
            'name'          => $user->name,
            'phone'         => $user->phone,
            'email'         => $user->email,
            'group'         => $user->group,
            'website'       => $user->website,
        ];
    }
}

请问这两种方式有什么区别？