为什么Symfony2不为preUpdate触发我的Doctrine事件侦听器？

Question

I am attempting to add a simple Blowfish password encoder to Symfony2.

When a user model is updated with a new password then I need to trigger the password to be encoded before the model is persisted. I want to use the preUpdate Doctrine event tag in my services.xml .

Unfortunately it is not being triggered.

Oddly I am also subscribing to the prePersist event and that is being triggered correctly.

Is there some difference I am missing or some reason this does not work?

services.xml

<service id="base.user.listener.persist" class="Base\UserBundle\Listener\PasswordEncoder">
    <tag name="doctrine.event_listener" event="preUpdate" />
    <tag name="doctrine.event_listener" event="prePersist" />
    <argument type="service" id="security.encoder.blowfish" />
</service>

PasswordEncoder.php (event subscriber)

/**
 * @param LifecycleEventArgs $args
 */
public function prePersist(LifecycleEventArgs $args) {
    $entity = $args->getEntity();
    $entity = $this->encodePassword($entity);
}

/**
 * @param LifecycleEventArgs $args
 */
public function preUpdate(LifecycleEventArgs $args) {
    die('preUpdate');
    $entity = $args->getEntity();
    $entity = $this->encodePassword($entity);
}

If you need to see more code just sing out.

Answer 1

OK so there is nothing wrong with the services.xml definition. It seems that you must duplicate the subscription information in the listening class ( PasswordEncoder.php ) with:

public function getSubscribedEvents() {
    return array(
        Events::prePersist,
        Events::preUpdate,
    );
}