Doctrine: update column on insert in other table - php

Question

I have 2 entities: Service and Session with one-to-many relationship
class Service{
/**
* #var int
*
* #ORM\Column(name="avg_score", type="integer")
*/
private $avgScore;
/**
* #ORM\OneToMany(targetEntity="Session", mappedBy="service")
*/
private $sessionList;
}
class Session{
/**
* #ORM\ManyToOne(targetEntity="Service", inversedBy="sessionList")
* #ORM\JoinColumn(name="service_id", referencedColumnName="id")
*/
private $service;
/**
* #var int
*
* #ORM\Column(name="score", type="integer", nullable=true)
*/
private $score;
}
With Doctrine QueryBuilder how can I update $avgScore of Service entity everytime new Session with $score is created?
This is what I tried to do:
$qb = $this->getDoctrine()->getEntityManager()->createQueryBuilder();
$q = $qb->update('AppBundle:Service', 's')
->join('AppBundle:Session', 'ss')
->addSelect('avg(ss.score) as score_avg')
->groupBy('ss.service')
->set('s.avgScore', 'score_avg')
->where('s.id = ?1')
->setParameter(1, $service->getId())
->getQuery();
$q->execute();

Answer 1

You need to create a Doctrine Events Listener
services:
my.listener:
class: AppBundle\EventListener\AvgScoreUpdater
tags:
- { name: doctrine.event_listener, event: prePersist }
And then in AvgScoreUpdater implement logic:
class AvgScoreUpdater
{
public function prePersist(LifecycleEventArgs $args)
{
$entity = $args->getEntity();
if (!($entity instanceof Session) || !$entity->getScore()) {
return;
}
$entityManager = $args->getEntityManager();
$service = $entity->getService();
// Then realize logic to update avg_score on a service
}
}