BlogFilter.php

<?php

namespace App\Filter;

use App\Entity\Blog;
use App\Entity\User;
use Doctrine\ORM\Mapping\ClassMetaData;
use Doctrine\ORM\Query\Filter\SQLFilter;

class BlogFilter extends SQLFilter
{
    public function addFilterConstraint(ClassMetadata $entityMetadata, $alias)
    {
        if (Blog::class !== $entityMetadata->reflClass->getName()) {
            return '';
        }

        $userId = $this->getParameter('user');

        if (null === $userId) {
            throw new \Exception('User was not set!');
        }

        return $alias.'.owner_id = '.$userId; // This SQL will be injected in 'WHERE'
    }
}

doctrine.yaml

# config/packages/doctrine.yaml
orm:
    entity_managers:
         default:
              filters:
                  blog_filter:
                      class: App\Filter\BlogFilter                           
                      enabled: false
  

InitUserFilterSubscriber.php

<?php

namespace App\EventSubscriber;

use App\Entity\User;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;

class InitUserFilterSubscriber implements EventSubscriberInterface
{
    private $tokenStorage;
    private $entityManager;

    public function __construct(TokenStorageInterface $tokenStorage, EntityManagerInterface $entityManager)
    {
        $this->tokenStorage = $tokenStorage;
        $this->entityManager = $entityManager;
    }

    public function onRequest()
    {
        if (!$this->tokenStorage->getToken() || !$user = $this->tokenStorage->getToken()->getUser()) {
            return;
        }

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

        $this->entityManager->getFilters()->enable('blog_filter');
        $this->entityManager->getFilters()->getFilter('blog_filter')->setParameter('user', $user->getId());
    }

    public static function getSubscribedEvents()
    {
        return [
            KernelEvents::REQUEST => 'onRequest',
        ];
    }
}