php - Doctrine2 的 preUpdate 在 Symfony2 中缺少 PreUpdateEventArgs 参数

Question

preUpdate 事件的 Doctrine2 文档 says

This event has a powerful feature however, it is executed with a PreUpdateEventArgs instance, which contains a reference to the computed change-set of this entity. This means you have access to all the fields that have changed for this entity with their old and new value.

听起来很有用!所以我做什么:

/**
 * Acme\TestBundle\Entity\Article
 *
 * @ORM\Entity
 * @ORM\HasLifecycleCallbacks
 */
class Article
{
    // ...

    /**
     * @ORM\PreUpdate
     */
    public function preUpdate(\Doctrine\ORM\Event\PreUpdateEventArgs $eventArgs)
    {
        if ( /* use $eventArgs here */ )

            $this->updatedAt = new \DateTime();
    }

    // ...
}

但运气不好 - 没有传递任何参数:

Catchable Fatal Error: Argument 1 passed to
Acme\TestBundle\Entity\Article::preUpdate() must be an instance of
Doctrine\ORM\Event\PreUpdateEventArgs, none given, called in
...\vendor\doctrine\lib\Doctrine\ORM\Mapping\ClassMetadataInfo.php on line 1540 and defined in ...\src\Acme\TestBundle\Entity\Article.php line 163

我想这在 Symfony2 中必须以其他方式工作。我该怎么做？

Answer 1

您应该记得，使用 PreUpdateEventArgs 实例，您可以访问该实体的所有已更改的字段及其旧值和新值。但是在您的示例中， updatedAt 不会在该变更集中。如果您尝试设置 updatedAt 值，您应该会收到错误消息:“字段‘updatedAt’不是实体的有效字段”。因此，您可以更改 updateAt 字段，然后使用 UnitOfWork:recomputeSingleEntityChangeSet。示例:

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

    if ($entity instanceof Product)
    {
        $entity->setDiscount(123);

        $uow->recomputeSingleEntityChangeSet(
            $em->getClassMetadata("XXXBundle:Product"),
            $entity
         );
    }
}

更多代码示例在我的博客文章中(在 russain:)):Update doctine entity in preUpdate event