SovBundle/Repository/Site/PageRepositoryQuery.php

<?php

namespace Lc\SovBundle\Repository\Site;

use Knp\Component\Pager\PaginatorInterface;
use Lc\SovBundle\Repository\AbstractRepositoryQuery;

class PageRepositoryQuery extends AbstractRepositoryQuery implements PageRepositoryQueryInterface
{
    public function __construct(PageRepository $repository, PaginatorInterface $paginator)
    {
        parent::__construct($repository, 'r', $paginator);
    }

    public function filterBySlug(string $slug)
    {
        return $this
            ->andWhere('.slug = :slug')
            ->setParameter('slug', $slug);
    }
}