private function getFindNewBySupplierQuery()
    {
        if (null !== $this->findNewBySupplierQuery) {
            return $this->findNewBySupplierQuery;
        }

        $qb = $this->createQueryBuilder();
        $as = $this->getAlias();

        return $this->findNewBySupplierQuery = $qb
            ->andWhere($qb->expr()->eq($as . '.supplier', ':supplier'))
            ->andWhere($qb->expr()->eq($as . '.state', ':state'))
            ->getQuery()
            ->setParameter('state', Model\SupplierOrderStates::STATE_NEW);
    }