Question

我有一个onFlush（）事件工作正常，但我需要做的是将其转换为preFlush（）或preUpdate（）都可以接受。我做了preFlush（）但由于某种原因它没有做任何事情。甚至没有错误。我错过了什么？

TEST：我将exit放在preFlush()中以查看是否正在调用它。结果是： 1 所以foreach()永远不会运行！这是一个空数组。我还测试了preUpdate（），其中的所有行都被破坏但没有插入数据。

public function preFlush(PreFlushEventArgs $args)
{
    $em = $args->getEntityManager();
    $uow = $em->getUnitOfWork();
    echo '1';
    foreach ($uow->getScheduledEntityUpdates() as $entity) {
        echo '2';
        if ($entity instanceof User) {
            echo '3';
        }
    }
    exit;
}

我在阅读documentation后创建了它们。

service.yml

services:
    entity.event_listener.user:
        class:  Site\FrontBundle\EventListener\Entity\UserListener
        tags:
            - { name: doctrine.event_listener, event: preUpdate }
            - { name: doctrine.event_listener, event: onFlush }
            - { name: doctrine.event_listener, event: preFlush }

使用onFlush（）示例：

class UserListener
{
    public function onFlush(OnFlushEventArgs $args)
    {
        $em = $args->getEntityManager();
        $uow = $em->getUnitOfWork();

        foreach ($uow->getScheduledEntityUpdates() as $entity) {
            if ($entity instanceof User) {
                $userLog = new UserLog();
                $userLog->setDescription($entity->getId() . ' being updated.');

                $em->persist($userLog);

                // Instead of $em->flush() cos we're already in flush process
                $userLogMetadata = $em->getClassMetadata(get_class($userLog));
                $uow->computeChangeSet($userLogMetadata, $userLog);
            }
        }
    }
}

不工作preFlush（）示例：

class UserListener
{
    public function preFlush(PreFlushEventArgs $args)
    {
        $em = $args->getEntityManager();
        $uow = $em->getUnitOfWork();

        foreach ($uow->getScheduledEntityUpdates() as $entity) {
            if ($entity instanceof User) {
                $userLog = new UserLog();
                $userLog->setDescription($entity->getId() . ' being updated.');

                $em->persist($userLog);

                // Instead of $em->flush() cos we're already in flush process
                $userLogMetadata = $em->getClassMetadata(get_class($userLog));
                $uow->computeChangeSet($userLogMetadata, $userLog);
            }
        }
    }
}

不工作preUpdate（）示例

class UserListener
{
    public function preUpdate(LifecycleEventArgs $args)
    {
        $entity = $args->getEntity();
        $em = $args->getEntityManager();
        $uow = $em->getUnitOfWork();

        if ($entity instanceof User) {
            $userLog = new UserLog();
            $userLog->setDescription($entity->getId() . ') been updated.');

            $em = $args->getEntityManager();
            $em->persist($userLog);
            $userLogMetadata = $em->getClassMetadata(get_class($userLog));
            $uow->computeChangeSet($userLogMetadata, $userLog);
        }
    }
}

Answer 1

<强> SOLUTION：

诀窍是，在preUpdate()事件中postFlush()之后保持不变。

注意： 虽然这可能不是最佳解决方案，但它可以回答问题，但可以使用事件订阅者或简单onFlush() - 来完成;事件监听器中的$uow->getScheduledEntityUpdates()。

<强> Service.yml

services:

    entity.event_listener.user_update:
        class:  Site\FrontBundle\EventListener\Entity\UserUpdateListener
        tags:
            - { name: doctrine.event_listener, event: preUpdate }
            - { name: doctrine.event_listener, event: postFlush }

事件监听器

<?php

namespace Site\FrontBundle\EventListener\Entity;

use Doctrine\ORM\Event\LifecycleEventArgs;
use Doctrine\ORM\Event\PostFlushEventArgs;
use Site\FrontBundle\Entity\User;
use Site\FrontBundle\Entity\UserLog;

class UserUpdateListener
{
    private $log = array();

    public function preUpdate(LifecycleEventArgs $args)
    {
        $entity = $args->getEntity();

        // False check is compulsory otherwise duplication occurs
        if (($entity instanceof User) === false) {
            $userLog = new UserLog();
            $userLog->setDescription($entity->getId() . ' being updated.');

            $this->log[] = $userLog;
        }
    }

    public function postFlush(PostFlushEventArgs $args)
    {
        if (! empty($this->log)) {
            $em = $args->getEntityManager();
            foreach ($this->log as $log) {
                $em->persist($log);
            }
            $em->flush();
        }
    }
}

Answer 2

阅读文档，

http://doctrine-orm.readthedocs.org/en/latest/reference/events.html#onflush

没有提及preFlush有关于更改的信息（我的意思是entityManager）

如果您查看Doctrine\ORM\UnitOfWork，您会看到在preFlush事件后计算更改集，因此如果您想与已更改的实体进行交互，则应使用onFlush

// Raise preFlush
    if ($this->evm->hasListeners(Events::preFlush)) {
        $this->evm->dispatchEvent(Events::preFlush, new PreFlushEventArgs($this->em));
    }

// Compute changes done since last commit.
if ($entity === null) {
    $this->computeChangeSets();
} elseif (is_object($entity)) {
    $this->computeSingleEntityChangeSet($entity);
} elseif (is_array($entity)) {
    foreach ($entity as $object) {
        $this->computeSingleEntityChangeSet($object);
    }
}

Answer 3

亲爱的 BentCoder ：
我正在使用Symfony 2.7版本。在您的帖子等事件监听器中使用 $ em-＆gt; flush 时，会发生以下错误： click-here-to-see-bug-description

而且，这是我的解决方案：

的 Service.yml

services: app.listener: class: AppBundle\EventListener\DoctrineListener arguments: ["@service_container"] tags: - { name: doctrine.event_listener, event: preUpdate, method: preUpdate } - { name: doctrine.event_listener, event: postUpdate, method: postUpdate }

事件监听器

namespace AppBundle\EventListener; use Symfony\Component\DependencyInjection\ContainerInterface; use Doctrine\ORM\Event\LifecycleEventArgs; use AppBundle\Entity; /** * Log activity on website * Class DoctrineListener * @package AppBundle\EventListener */ class DoctrineListener { /** * @var ContainerInterface */ private $_container; /** * @var Array */ private $_activities; /** * DoctrineListener constructor. * @param ContainerInterface $container */ public function __construct(ContainerInterface $container) { $this->_container = $container; } /** * @param LifecycleEventArgs $args */ public function preUpdate(LifecycleEventArgs $args) { $entityManager = $args->getEntityManager(); $entity = $args->getEntity(); $activityEntity = new Entity\Activity(); $activityEntity->setAction(Entity\Activity::ACTION_EDIT); $activityEntity->setActionAt(new \DateTime()); $activityEntity->setIpAddress($this->_container->get('request')->getClientIp()); switch (true) { case $entity instanceof Entity\Goods: $repository = $entityManager->getRepository('AppBundle:Goods'); $activityEntity->setType(Entity\Activity::TYPE_GOODS); $message = 'User: <strong>%s</strong> sửa mẫu hàng hóa <strong>%s</strong>'; break; default: return; } if (isset($repository) && $args->getEntityChangeSet()) { $user = $this->_container->get('security.context')->getToken()->getUser(); $recordBefore = clone $entity; foreach ($args->getEntityChangeSet() as $key => $value) { $method = 'set'.ucfirst($key); $recordBefore->$method($value[0]); } $activityEntity->setFosUser($user); $activityEntity->setRecordBefore(serialize($recordBefore)); $activityEntity->setRecordAfter(serialize($entity)); $activityEntity->setMessage( sprintf( $message, $user->getUserProfile()->getFullName(), (string) $recordBefore ) ); $this->_activities[] = $activityEntity; } return; } /** * @param LifecycleEventArgs $args */ public function postUpdate(LifecycleEventArgs $args) { if (sizeof($this->_activities)) { $entityManager = $args->getEntityManager(); foreach ($this->_activities as $activity) { $entityManager->persist($activity); } $entityManager->flush(); } } }

希望这会对某人有所帮助！

使用Event Listener创建preUpdate或preFlush事件

3 个答案: