Symfony 5.4 detect autmatically the entity properties have changed with doctrine.orm.entity_listener

sc1233 0
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I have created an event listener to send email if entity name has updated. My question is, I’d like know what properties have changed (e.g), $entity->getName() = “Jim” became “Jimmy” ?

/!\ I'll detect only changed properties.


public function postUpdate(Entity $entity, LifecycleEventArgs $event): void {
    // “Jim”


    // Now is “Jimmy”

}

Thanks

doctrine orm event-listener symfony
2 Answers
$event->get(Entity|Object)Manager()->getUnitOfWork()->getEntityChangeSet($entity)
hazadam0

I think it would better to use a preUpdateEvent in your case.

Doctrine\ORM\Event\PreUpdateEventArgs contains a few method that would help your in your use case.

For example hasChangedField, getNewValue and getOldValue.

/**
 * Checks if field has a changeset.
 *
 * @param string $field
 *
 * @return bool
 */
public function hasChangedField($field)
{
    return isset($this->entityChangeSet[$field]);
}

So you could replace your postUpdate listener with a preUpdate listener:

public function preUpdate(Entity $entity, PreUpdateEventArgs $args): void {
    if($args->hasChangedField('name')){
        $newName = $args->getNewValue('name');
        $oldName = $args->getOldValue('name');
    }

}

Otherwise if you want to keep your postUpdate listener, you will need use the unit of work to find your entity changeset and see if the name field has changed.

Dylan KAS0
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