如何在 preUpdate 事件侦听器中更改字段的值? [英] How do I change a field's value in preUpdate event listener?

问题描述

文档说:

刷新操作不再识别对传递实体字段的更改，请使用传递给事件的计算更改集来修改原始字段值.

Changes to fields of the passed entities are not recognized by the flush operation anymore, use the computed change-set passed to the event to modify primitive field values.

但它也说:

getEntityChangeSet() 获取变更集数组的副本.对此返回数组的更改不影响更新.

getEntityChangeSet() to get a copy of the changeset array. Changes to this returned array do not affect updating.

这是否意味着我无法在 preUpdate 事件侦听器中更改实体的字段?如果没有，我将如何完成此更新?

Does this mean I can not change fields of an entity in preUpdate event listener? If not, how would I go about accomplishing this update?

推荐答案

显然您需要自己重新计算变更集才能使变更生效:

Apparently you need to recompute the changeset yourself for the changes to take effect:

$em = $args->getEntityManager();
$uow = $em->getUnitOfWork();
$meta = $em->getClassMetadata(get_class($entity));
$uow->recomputeSingleEntityChangeSet($meta, $entity);

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