Question

Symfony v4.2

我正在尝试使用symfony的规范化器和序列化器将我的实体转换为JSON。

我遵循“组”注释模式，因为它听起来像是最直观且最有前途的方法。

根据the docs，我们必须手动实例化ClassMetadataFactory才能加载AnnotationLoader。我仍在使用ObjectNormalizer，该功能在使用注释之前可以正常工作。

这是我的序列化方法：

/**
 * @param bool $event Serialize all event fields (except references)
 * @param bool $meta Serialize referenced meta instance
 * @param bool $targets Serialize referenced target instances
 * @param bool $users Serialize referenced user instances
 * @param bool $videos Serialize referenced video instances
 * @param bool $photos Serialize referenced photo instances
 * @return string
 */
public function serialize($event = true, $meta = false, $targets = false, $users = false, $videos = false, $photos = false) {
    $serializingGroups = [];
    if ($event) {
        $serializingGroups[] = 'event';
    }
    if ($meta) {
        $serializingGroups[] = 'meta';
    }
    if ($targets) {
        $serializingGroups[] = "targets";
    }
    if ($users) {
        $serializingGroups[] = 'users';
    }
    if ($videos) {
        $serializingGroups[] = 'videos';
    }
    if ($photos) {
        $serializingGroups[] = 'photos';
    }

    $classMetadataFactory = new ClassMetadataFactory(new AnnotationLoader(new AnnotationReader()));
    $normalizer = new ObjectNormalizer($classMetadataFactory);
    $serializer = new Serializer([$normalizer], [new JsonEncoder()]);

    $data = $serializer->normalize($this, null, ['groups' => $serializingGroups]);
    return $serializer->serialize($data, 'json');
}

如果我不需要序列化关联，这些组在那里可以加快序列化。

现在我使用组批注，json看起来像这样

"{"id":2,
"title":"test",
"description":"<p>&nbsp;test<\/p>",
"subscriptionPrice":"0.00",
"subscriptionUntil":[], // DATE  - WHY EMPTY ARRAY?
"start":[], // DATE  - WHY EMPTY ARRAY?
"end":[], // DATE  - WHY EMPTY ARRAY?
"allDay":false,
"creationDate":[], // DATE  - WHY EMPTY ARRAY?
"editDate":[], // DATE  - WHY EMPTY ARRAY?
"editable":true,
"startEditable":true,
"durationEditable":true,
"overlap":false,
"color":"#9EABAB",
"backgroundColor":"#9eabab",
"borderColor":"#9eabab",
"textColor":"#000000",
"isRecurring":true,
"meta":[], // ASSOCIATED ENTITY  - WHY EMPTY ARRAY?
"targets":[[]] // ASSOCIATED COLLECTION OF ENTITIES  - WHY EMPTY ARRAY?
}"

当我不使用注释时为什么会起作用？为什么在使用批注时日期和其他实体为空数组？

Answer 1

尤里卡！

这是我的序列化方法中的代码段：

$classMetadataFactory = new ClassMetadataFactory(new AnnotationLoader(new AnnotationReader()));
$normalizer = new ObjectNormalizer($classMetadataFactory);
$serializer = new Serializer([
    // Add a Datetimenormalizer as the first normalizer in the list
    new DatetimeNormalizer(),
    $normalizer
], [new JsonEncoder()]);

return $serializer->serialize($this, 'json', [
    // $serializer->addCircularReferenceHandler() IS DEPRECATED
    // define the handler like this:
    ObjectNormalizer::CIRCULAR_REFERENCE_HANDLER => function ($event) {
        return '/event/'.$event->id;
    }
    ,ObjectNormalizer::GROUPS => $serializingGroups
]);

首先，meta和targets未序列化的原因是因为我在Meta和Target实体中导入了错误的内容。确保它是：use Symfony\Component\Serializer\Annotation\Groups; ...所以...是的...继续前进。

当我注释掉//,ObjectNormalizer::GROUPS => $serializingGroups时，日期确实已序列化。那么，为什么在未注释掉组时不进行序列化呢？我的猜测是DateTime类没有Groups批注，因此规范化器永远无法获得任何DateTime属性

这可以通过在数组中添加DatetimeNormalizer作为第一个规范化器来解决：$serializer = new Serializer([new DatetimeNormalizer(),$normalizer])

这是我的实体正确序列化的方式：D

使用注释组进行序列化

1 个答案: