php - Symfony 和 JMSSerialier，无法添加侦听器以添加额外字段

Question

我试图遵循这个答案： Add extra fields using JMS Serializer bundle

但没有变化..

我想在发送之前向序列化实体（在 json 中）添加额外的字段。有什么我错过的吗？

这是我的听众：

<?php

namespace My\MyBundle\Listener;

use JMS\DiExtraBundle\Annotation\Service;
use JMS\DiExtraBundle\Annotation\Tag;
use JMS\DiExtraBundle\Annotation\Inject;
use JMS\DiExtraBundle\Annotation\InjectParams;
use Symfony\Component\HttpKernel\Event\PostResponseEvent;
use My\MyBundle\Entity\Dossier;
use JMS\Serializer\Handler\SubscribingHandlerInterface;
use JMS\Serializer\EventDispatcher\EventSubscriberInterface;
use JMS\Serializer\EventDispatcher\PreSerializeEvent;
use JMS\Serializer\EventDispatcher\ObjectEvent;
use JMS\Serializer\GraphNavigator;
use JMS\Serializer\JsonSerializationVisitor;

/**
 * Add data after serialization
 *
 * @Service("my.listener.serializationlistener")
 * @Tag("jms_serializer.event_subscriber")
 */
class SerializationListener implements EventSubscriberInterface
{

    /**
     * @inheritdoc
     */
    static public function getSubscribedEvents()
    {
        return array(
            array('event' => 'serializer.post_serialize', 'class' => 'My\MyBundle\Entity\Dossier', 'method' => 'onPostSerialize'),
        );
    }

    public function onPostSerialize(ObjectEvent $event)
    {
        $event->getVisitor()->addData('someKey','someValue');
    }
}

和我的控制器中的调用：

$serializer = $this->container->get('jms_serializer');
$res = $serializer->serialize($dossier, 'json');

我还添加了以下服务声明：

services:
    my.mybundle.listener:
        class: My\MyBundle\Listener\SerializationListener

我声明了另一个服务，当我更改它的声明名称时，symfony give and error，而不是当我使用侦听器服务时。

提前致谢

Answer 1

$visitor = $event->getVisitor();
$visitor->visitProperty(new StaticPropertyMetadata('', 'some_key', null),'some_key');

该addData方法适用于旧版本的 JMS Serializer。不要忘记导入StaticPropertyMetadata.

Answer 2

也许，您忘记添加标签。您的侦听器声明应如下所示

services:
    my.bundle.listener:
        class: My\MyBundle\Listener\SerializationListener
        tags:
            -  { name: jms_serializer.event_subscriber }