Symfony 5.4: Get all posts ids by slug of tag

PostFetcher.php

<?php

namespace App\ReadModel\Blog;

use Doctrine\DBAL\Connection;
use Doctrine\DBAL\Exception;

class PostFetcher
{
    public function __construct(
        private Connection $connection
    ) {
    }

    /**
     * @throws Exception
     */
    public function findAllActiveByTag(string $slug): array
    {
        return $this->connection->createQueryBuilder()
            ->select('bp.id')
            ->from('blog_posts', 'bp')
            ->leftJoin('bp', 'blog_post_tag', 'bpt', 'bp.id = bpt.post_id')
            ->leftJoin('bpt', 'blog_tags', 'bt', 'bt.id = bpt.tag_id')
            ->where('bt.slug = :slug')
            ->setParameter('slug', $slug)
            ->executeQuery()
            ->fetchFirstColumn();
    }
}