Symfony 侦听器 - postUpdate doublon

Question

我是运行 Symfony 3 LTS。我有一个订阅者正在监听 postUpdate 事件，以便将我数据库中产品的所有 activity 登录到数据库。下面是我的代码：

use AppBundle\Entity\History;

public function getSubscribedEvents()
{
    return [
        Events::postUpdate,
    ];
}

public function postUpdate(LifecycleEventArgs $args)
{
    if(!is_null($this->tokenStorage->getToken())) {
        $user = $this->tokenStorage->getToken()->getUser();
        $entity = $args->getObject();
        $em = $args->getEntityManager();
        if ($entity instanceof Product) {
            $history = new History($user, "Product #5 has been updated");
            $em->persist($history);
        }
        $em->flush();
    }
}

问题：History 在数据库中插入了两次。我不知道为什么。我试图删除 persist() and/or flush() 方法，但没有创建任何内容。

PS：我的实体 Product 和 History 之间没有关系。它一定不会。我的问题只是重复行为。

Answer 1

我没有正确答案，但有一个解决方法：

use AppBundle\Entity\History;

    // Will contains the User ID to avoid duplicate log
    private $flushed = [];

    public function getSubscribedEvents()
    {
        return [
            Events::postUpdate,
        ];
    }

    public function postUpdate(LifecycleEventArgs $args)
    {
        if(!is_null($this->tokenStorage->getToken())) {
            $user = $this->tokenStorage->getToken()->getUser();
            $entity = $args->getObject();
            $em = $args->getEntityManager();
                                            // Check that the User.id is not already created in History during the update PHP Process
            if ($entity instanceof Product && !in_array($user->getId(), $this->flushed)) {
                $history = new History($user, "Product #5 has been updated");
                $em->persist($history);
                // Add the user ID in our array to avoid duplicate
                $this->flushed[] = $user->getId();
            }
            $em->flush();
        }
    }

Symfony 侦听器 - postUpdate doublon

Symfony listener - postUpdate doublon

symfony

doctrine

event-listener

symfony-3.4