Doctrine event listener "..." must specify the "event" attribute

Question

I want to register Doctrine Event Listener to hash user's password before persisting User object to database:

This is my Event Listener class:

<?php

namespace AppBundle\Doctrine;

use AppBundle\Entity\User;
use Doctrine\Common\EventSubscriber;
use Doctrine\ORM\Event\LifecycleEventArgs;
use Symfony\Component\Security\Core\Encoder\UserPasswordEncoderInterface;

class HashPasswordListener implements EventSubscriber
{
    private $passwordEncoder;

    public function __construct(UserPasswordEncoderInterface $passwordEncoder)
    {
        $this->passwordEncoder = $passwordEncoder;
    }

    public function getSubscribedEvents()
    {
        return ['prePersist', 'preUpdate'];
    }

    public function prePersist(LifecycleEventArgs $args)
    {
        $entity = $args->getEntity();

        if (!$entity instanceof User) {
            return;
        }

        $this->encodePassword($entity);
    }

    /**
     * @param User $entity
     */
    private function encodePassword(User $entity)
    {
        $encoded = $this->passwordEncoder->encodePassword($entity, $entity->getPlainPassword());
        $entity->setPassword($encoded);
    }

    public function preUpdate(LifecycleEventArgs $args)
    {
        $entity = $args->getEntity();

        if (!$entity instanceof User) {
            return;
        }

        $this->encodePassword($entity);
    }
}

And I register this event listener in services.yml file

    AppBundle\Doctrine\HashPasswordListener:
    tags: ['doctrine.event_listener']

But whenever I want to insert a user either by loading fixtures data or from the web application I receive such an error:

[Symfony\Component\DependencyInjection\Exception\InvalidArgumentException]
  Doctrine event listener "AppBundle\Doctrine\HashPasswordListener" must specify the "event" attribute.

I tried to add event attribute in tags that didn't work either.

I'm using Symfony version 3.3 with Doctrine 2.5

Configured Doctrine in config.yml so:

doctrine:
dbal:
    driver: pdo_sqlite
    path: '%kernel.project_dir%/app/sqlite.db'
    charset: UTF8

Where is the fault?

Answer 1

you use un subscriber so you must tag doctrine event subscriber not event listener that requires attribute event.

AppBundle\Doctrine\HashPasswordListener:
tags: ['doctrine.event_subscriber']