public function createQueryBuilder($findDrafts = false)
    {
        /* @var \Doctrine\MongoDB\Query\Builder $qb */
        /** @noinspection PhpUndefinedClassInspection */
        /** @noinspection PhpUndefinedMethodInspection */
        $qb = parent::createQueryBuilder();

        if (null !== $findDrafts) {
            $qb->field('isDraft')->equals($findDrafts);
        }
        return $qb;
    }