从 JsonResponse 对象内的 Doctrine 返回数据 [英] Return data from Doctrine inside a JsonResponse object

问题描述

我的问题是我想在 JsonResponse 对象中返回我从 Doctrine 获得的一些数据.我使用 QueryBuilder 获取数据，如下所示:

My problem is that I want to return some data that I get from Doctrine inside a JsonResponse object. I get the data with a QueryBuilder, like this:

$qb = $this->getDoctrine()->getRepository(User::class)->createQueryBuilder('u');
$data = $qb->getQuery()->getResult();

$JSONResponse = new JsonResponse();
$JSONResponse->setData($data);

然而，JsonResponse 里面的数据看起来是空的:

However, the data inside the JsonResponse looks empty:

data: {
    [],
    [],
    [],
    [],
    .....
}

有谁知道我如何以这种方式正确返回数据?

Does anyone know how I can return the data this way correctly?

推荐答案

我认为您使用 Doctrine 从数据库中正确获取了 User 数组(您可以使用简单的 <获取它们后的 code>var_dump($data).

I think you're getting the array of Users correctly from the DB using Doctrine (you can check that with a simple var_dump($data) after you fetch them.

但是，当您将 User 数组放入 JsonResponse 时，这些对象将被序列化，并且因为(我猜) 中的属性User类是private，每一个的序列化只是一个空数组[]...

However, when your put you array of Users into the JsonResponse, those objects will be serialized, and since (I guess) the properties in the User class are private, the serialization of each one is just an empty array []...

您需要将一个普通的数据数组传递给 JsonResponse 而不是 User 的数组，对此您有几个选择:

You need to pass a plain array of data to JsonResponse instead of an array of Users, for which you have a few options:

1. 使用 $qb->getQuery()->getArrayResult() 直接获取普通数组而不是 User 数组对象.
2. 使User 类实现JsonSerializable 接口，因此您可以定义对象的序列化方式.
3. (推荐)使用一些专门的序列化库(如 JMS Serializer(或手动，如果您愿意)，然后将该数据放入JsonResponse.

1. Use $qb->getQuery()->getArrayResult() to get directly a plain array instead of an array of User objects.
2. Make User class implement JsonSerializable interface, so you define how the objects should be serialized.
3. (Recommended) Generate a plain array from your User objects using some specialized serialization library like JMS Serializer (or manually if you prefer), and then put that data into the JsonResponse.

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