public function findAdmins()
    {
        $qb = $this->createQueryBuilder('u');

        $qb->where($qb->expr()->eq('u.admin', $qb->expr()->literal(true)))
            ->andWhere($qb->expr()->isNull('u.templateOwner'))
            ->andWhere($qb->expr()->eq('u.deleted', $qb->expr()->literal(false)));

        return $qb->getQuery()->getResult();
    }