Fix attach entity listener when reset class metadata factory

[vuongxuongminh]

When resetting entity manager via registry, if we use Doctrine\ORM\Tools\AttachEntityListenersListener to add entity event listeners, it can not be reattached because it delete listener after add on the first time then we will lose all entity listeners after reset entity manager.

Symfony entity listener example:

<?php

declare(strict_types=1);

namespace App\EntityEventListener;


use App\Entity\Company;
use Doctrine\Bundle\DoctrineBundle\Attribute\AsEntityListener;


#[AsEntityListener(event: 'prePersist', entity: Company::class)]
class CompanyListener
{
    public function prePersist() : void
    {
        echo 'It work!';
    }
}

and console command execution:

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $manager = $this->registry->getManager();
        $company = new Company();
        $company->setText('1');
        $manager->persist($company);
        $manager->flush();

        $this->registry->resetManager(); /// there's the problem

        $company = new Company();
        $company->setText('2');
        $manager->persist($company);
        $manager->flush();


        return 0;
    }

Expect It work! should be printed twice but only once.

[greg0ire]

I found this suspicious at first, but this does not seem to break any tests so…

[greg0ire]

Looking at this listener, what it does is attach entity listeners as soon as class metadata is loaded. After that, it considers its job done forever, hence the unset (to save memory I guess).

[greg0ire]

Thanks @vuongxuongminh !