Symfony 4 Doctrine EventSubscriber not used - symfony

Question

Trying to register a Doctrine EventSubscriber but nothing is ever actually fired.
I have, on the Entity, in question, set the #ORM\HasLifeCycleCallbacks annotation.
Here's the Subscriber:
<?php
namespace App\Subscriber;
use App\Entity\User;
use Doctrine\Common\EventSubscriber;
use Doctrine\ORM\Event\LifecycleEventArgs;
use Doctrine\ORM\Event\PreUpdateEventArgs;
use Doctrine\ORM\Events;
use Symfony\Component\Security\Core\Encoder\UserPasswordEncoderInterface;
class UserPasswordChangedSubscriber implements EventSubscriber
{
private $passwordEncoder;
public function __construct(UserPasswordEncoderInterface $passwordEncoder)
{
$this->passwordEncoder = $passwordEncoder;
}
public function getSubscribedEvents()
{
return [Events::prePersist, Events::preUpdate, Events::postLoad];
}
public function prePersist(LifecycleEventArgs $args)
{
$entity = $args->getEntity();
if (!$entity instanceof User) {
return null;
}
$this->updateUserPassword($entity);
}
public function preUpdate(PreUpdateEventArgs $event)
{
$entity = $event->getEntity();
if (!$entity instanceof User) {
return null;
}
$this->updateUserPassword($entity);
}
private function updateUserPassword(User $user)
{
$plainPassword = $user->getPlainPassword();
if (!empty($plainPassword)) {
$encodedPassword = $this->passwordEncoder->encodePassword($user, $plainPassword);
$user->setPassword($encodedPassword);
$user->eraseCredentials();
}
}
}
The part that is making this particuarly frustrating is that this same code and configuration was fine in Symfony 3 whe autowiring was turned off and I manually coded all my services.
However, now, even if I manually code up a service entry for this, in the usual way, still nothing happens.
EDIT:
Here is my services.yaml after trying what suggested Domagoj from the Symfony docs:
App\Subscriber\UserPasswordChangedSubscriber:
tags:
- { name: doctrine.event_subscriber, connection: default }
It didn't work. Interestingly, If I un-implement the EventSubscriber interface, Symfony throws an exception (rightly). Yet my break points in the code are completely ignored.
I've considered an EntityListener, but it cannot have a constructor with arguments, doesn't have access to the Container and I shouldn't have to; this ought to work :/

Answer 1

I ended up figuring this out. The field that I was specifically updating was transient, and therefore Doctrine didn't consider this an Entity change (rightly).
To fix this, I put
// Set the updatedAt time to trigger the PreUpdate event
$this->updatedAt = new DateTimeImmutable();
In the Entity field's set method and this forced an update.
I also did need to manually register the Subscriber in the services.yaml using the following code. symfony 4 autowiring wasn't auto enough for a Doctrine Event Subscriber.
App\Subscriber\UserPasswordChangedSubscriber:
tags:
- { name: doctrine.event_subscriber, connection: default }

Answer 2

For your first problem, doctrine event subscribers are not autoconfigured/auto-tagged. For the reasons and solutions, you have some responses here.
Personnaly, I just have one Doctrine ORM mapper, so I put this in my services.yaml file :
services:
_instanceof:
Doctrine\Common\EventSubscriber:
tags: ['doctrine.event_subscriber']

Answer 3

You have to register your Event Listener as a service and tag it as doctrine.event_listener
https://symfony.com/doc/current/doctrine/event_listeners_subscribers.html#configuring-the-listener-subscriber