Question

我有以下Doctrine实体设置：

class MainEntity
{
    /**
     * @var SecondEntity[]
     *
     * @ORM\OneToMany(targetEntity="SecondEntity", mappedBy="mainEntity", cascade={"persist"})
     */
    private $secondEntities;

    /**
     * @var integer
     *
     * @ORM\Column(type="integer", nullable=false, name="second_entities_count")
     */
    private $secondEntitiesCount;

    ...
}

class SecondEntity
{
    /**
     * @var MainEntity
     *
     * @ORM\ManyToOne(targetEntity="MainEntity", inversedBy="secondEntities")
     * @ORM\JoinColumn(name="main_entity_id", referencedColumnName="id", nullable=false)
     */
    private $mainEntity;

    ...
}

创建或删除SecondEntity时，我希望相关$secondEntitiesCount中的MainEntity进行相应更新。

为实现这一目标，我创建了一个onFlush订阅者，该订阅者收集SecondEntity个对象的所有预定删除和插入

$delsertions = array_merge(
    $unitOfWork->getScheduledEntityInsertions(),
    $unitOfWork->getScheduledEntityDeletions()
);
foreach ($delsertions as $entity) {
    if ($entity instanceof SecondEntity) {
        $mainEntity = $entity->getMainEntity();

        $mainEntityMeta = $em->getClassMetadata(MainEntity::class);
        $unitOfWork->recomputeSingleEntityChangeSet($mainEntityMeta, $mainEntity);

        dump($mainEntity->getSecondEntities); // The creation/deletion of the current entity is not reflected here!
    }
}

问题在于，在上面的dump()中，在创建/删除触发订阅者的实体后，集合尚未相应更新。例如，如果我为给定的SecondEntity创建第一个MainEntity，则$secondEntities集合将为空。如果我删除唯一的SecondEntity，则$secondEntities集合中仍会包含该对象。在这种情况下，recomputeSingleEntityChangeSet()电话似乎无能为力。

如何强制正确更新集合？

Answer 1

你可以创建一个这样的监听器：

use Doctrine\ORM\Event\LifecycleEventArgs;

class UpdateMainListener
{
    public function prePersist(LifecycleEventArgs $args)
    {
        $entity = $args->getEntity();

        // only act on "SecondEntity" entity
        if (!$entity instanceof SecondEntity) {
            return;
        }

        $main = $entity->getMainEntity();
        if(!is_null($main))
            $main->increaseSecondEntitiesCount();
    }

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

        // only act on "SecondEntity" entity
        if (!$entity instanceof SecondEntity) {
            return;
        }

        $main = $entity->getMainEntity();
        if(!is_null($main))
            $main->decreaseSecondEntitiesCount();
    }
}

然后设置服务：

mybundle.prepersist.listener:
    class: MyBundle\EventListener\UpdateMainListener
    tags:
        - { name: doctrine.event_listener, event: prePersist }
mybundle.preremove.listener:
    class: MyBundle\EventListener\UpdateMainListener
    tags:
        - { name: doctrine.event_listener, event: preRemove }

使用新创建/删除的对象更新相关实体的集合（onFlush）

1 个答案: