how to custom global response format for dingo/API?

我目前接口响应代码是这样的：

$categories = Category::first();
return $this->response->item($categories, new CategoryTransformer());

响应的结果是这样的：

{
    "data": {
        "id": 1,
        "name": "大侠",
        "alias": "daxia"
    }
}

但我想响应下面的格式：

{
    "data": {
        "id": 1,
        "name": "大侠",
        "alias": "daxia"
    },
    "status": "success",
    "code":200,
    "message":"获取信息成功"
}

我将响应结果再次包装后，发现响应结果是没有 Transformer 前的：

$categories = Category::first();
$data = $this->response->item($categories, new CategoryTransformer());

return \Response::json([
    'status'=>'success',
    'code'=> 200,
    'message' => '获取分类列表成功',
    'data'=> $data,
]);

响应结果：

{
    "status": "success",
    "code": 200,
    "message": "获取分类列表成功",
    "data": {
        "exception": null,
        "original": {
            "id": 1,
            "name": "大侠",
            "alias": "daxia",
            "created_at": null,
            "updated_at": null
        },
        "headers": []
    }
}

求大神指导啊！不知道咋弄了，怎么才能定义一个全局的响应方法，每次响应的时候调用此方法传入必要参数呢？