在实体刷新时创建实体 [英] Create entity on entity flush

问题描述

我怎样才能做到这一点:

How can I achieve this:

例如，我有一个名为 Issue 的实体.我需要记录此实体字段的更改.
如果用户更改了 Issue 实体上的字段 "status"，我需要与用户一起创建一个关于它的数据库记录，谁更改了该字段、以前的状态和新状态.

For example, I have an entity called Issue. I need to log changes of a field of this entity.
If a user changes the field "status" on the Issue entity I need to create a database record about it with the user, who changed the field, the previous status and the new status.

使用:Symfony2 + Doctic2.

Using: Symfony2 + doctrine2.

推荐答案

您可以使用 事件订阅者，并将其附加到 ORM 事件侦听器(在 symfony 2 中，有 相关文档):

You can use an event subscriber for that, and attach it to the ORM event listener (in symfony 2, there's docs about that):

namespace YourAppSubscriber;

use DoctrineCommonEventSubscriber;
use DoctrineORMEventOnFlushEventArgs;
use DoctrineORMEvents;
use YourAppEntityIssue;
use YourAppEntityIssueLog;

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

        foreach ($uow->getScheduledEntityUpdates() as $updated) {
            if ($updated instanceof Issue) {
                $em->persist(new IssueLog($updated));
            }
        }

        $uow->computeChangeSets();
    }

    public function getSubscribedEvents()
    {
        return array(Events::onFlush);
    }
}

您最终可以检查变更集，正如我在 是否有一种内置方法可以获取 Doctrine 2 实体中所有更改/更新的字段.

You can eventually check the changeset as I've explained at Is there a built-in way to get all of the changed/updated fields in a Doctrine 2 entity.

我在示例中省略了 IssueLog 的实现，因为这取决于您自己的要求.

I left the implementation of IssueLog out of the example, since that is up to your own requirements.

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