php - 在 Symfony 2.1 中为 preUpdate 调用添加额外的持久化调用

Question

我的应用程序中有一个 preUpdate 监听器。当它被触发时，我希望它创建一些额外的记录。下面是基本功能的简化示例。在当前的实现中，新事件似乎没有被持久化。我还需要在这里打其他电话吗？谢谢。

public function preUpdate(Event\LifecycleEventArgs $eventArgs)
{
    $em = $eventArgs->getEntityManager();
    $uow = $em->getUnitOfWork();
    $entity = $eventArgs->getEntity();

    $updateArray = $eventArgs->getEntityChangeSet();

    //Updates
    if (($entity instanceof Bam) === false) {
        $thing = new OtherThing();
        $thing->setFoo('bar');

        $uow->persist($thing);
    }

    $uow->computeChangeSets();
}

Answer 1

关键是在刷新后保留它们：

<?php

namespace Comakai\CQZBundle\Handler;

use Symfony\Component\DependencyInjection\ContainerInterface;
use Doctrine\Common\EventSubscriber;
use Doctrine\ORM\Event;

/**
 * 
 */
class YourHandler implements EventSubscriber
{
    protected $things = [];

    public function getSubscribedEvents()
    {
        /**
         * @todo Check if this is running in the console or what...
         */
        if (isset($_SERVER['HTTP_HOST'])) {

            return [
                'preUpdate',
                'postFlush'
            ];
        }

        return [];
    }

    public function preUpdate(Event\LifecycleEventArgs $eventArgs)
    {
        $em = $eventArgs->getEntityManager();
        $uow = $em->getUnitOfWork();
        $entity = $eventArgs->getEntity();

        $updateArray = $eventArgs->getEntityChangeSet();

        //Updates
        if (($entity instanceof Bam) === false) {

            $thing = new OtherThing();
            $thing->setFoo('bar');

            $this->things[] = $thing;
        }
    }

    public function postFlush(Event\PostFlushEventArgs $event)
    {
        if(!empty($this->things)) {

            $em = $event->getEntityManager();

            foreach ($this->things as $thing) {

                $em->persist($thing);
            }

            $this->things = [];
            $em->flush();
        }
    }
}