laravel+dingo/api书写API接口的返回体中code和message是怎样配置的？

Question

如下是我写的API接口的controller：<?phpnamespace App\Http\Controllers\Lucky;use Illuminate\Http\Request;use App\Http\Controllers\BaseController as BaseController;use App\Models\Card;use App\Http\Transformers\CardsTransformer;class CardsController extends BaseController{    public function test(Request $request) {         $unionId = $request->input('unionId');         $card = new Card;         $card->union_id = $unionId;         $card->fi_card = 1;         $card->s_card = 2;         $card->t_card = 3;         $card->fo_card = 4;         $card->save();        return $this->response->item($card, new CardsTransformer());     } }这样写，调用该接口得到的返回体如下：{    "data": {        "unionId": "test",        "fiCard": 1,        "sCard": 2,        "tCard": 3,        "foCard": 4     } }可是我认为正确的API接口的返回体应该如下：{    code:0,     message:"ok",     data:{},    useTime:0.017374038696289062}请问在laravel和dingo/api的技术栈中,怎么去为每个接口的返回体配置code和message字段？及其相应的内容？