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namespace True\KernelBundle\EventListener;

use Doctrine\Common\EventArgs;
use Doctrine\DBAL\Connection;
use Symfony\Component\HttpFoundation\Request;
use Doctrine\ORM\EntityManager;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use True\KernelBundle\Entity\WebSite;

class SaaSWebSiteListener
    private $request;
    private $connection;
    private $doctrine;
    private $logger;
    private $em;

    public function __construct (EntityManager $em)
        $this->em = $em;

    public function onKernelRequest(GetResponseEvent $event){
        $request = $event->getRequest();
        $host = $request->getHttpHost();
        $website = $this->em->getRepository(WebSite::class)->findOneBy(['domain' => $host]); 
        echo __FILE__;
        $filter = $this->em->getFilters()->enable('saas_website_filter');
        $filter->setParameter('domain', $host);
        echo $filter->getParameter('domain');

Doctrine SQL Filter

namespace True\KernelBundle\Filter;

use Doctrine\ORM\Mapping\ClassMetaData;
use Doctrine\ORM\Query\Filter\SQLFilter;

use True\KernelBundle\EventListener\SaaSWebSiteListener;
use True\KernelBundle\Entity\WebSite;

class WebSiteFilter extends SQLFilter
    protected $listener;
    protected $entityManager;

    public function addFilterConstraint(ClassMetadata $targetEntity, $targetTableAlias)
        $class = $targetEntity->getName();
        $domainId = $this->getParameter('domainId');
        var_dump($domainId); echo '<br />';
        $addCondSql = "(domain_id = {$domainId})";
        echo __FILE__;echo '<br />';
        return $addCondSql;

doctrine yml
        default_entity_manager:   default
        auto_generate_proxy_classes: "%kernel.debug%"
                auto_mapping: true
                          class:    True\KernelBundle\Filter\WebSiteFilter
                          enabled:  true
listener yml
        class: True\KernelBundle\EventListener\SaaSWebSiteListener
        arguments: ["@doctrine.orm.entity_manager"]
        scope:      request
                name: kernel.event_listener
                event: kernel.request
                method: onKernelRequest
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