filter doctrine

		$qb= $this->em->getRepository(DCE::class)->createQueryBuilder();

		$qb->select('dce')
          	  ->addSelect("COUNT(dc) amount")
		  ->from($this->entityPath, 'dce')
          	  ->join('dce.discount_coupons', 'dc');

		if (!empty($filter)) {
			if (isset($filter['title']) && !empty($filter['title'])) {
				$qb->andWhere('dce.title LIKE :title')
					->setParameter("title", '%' . addcslashes($filter['title'], '%_') . '%');
			}



			if (isset($filter['amount']) && !empty($filter['amount'])) {
				$qb->andWhere('amount ' . addcslashes($filter['amount_operator'], '%_') . ' :amount')
					->setParameter("amount", (int) $filter['amount']);
			}




			if (isset($filter['is_valid'])) {
				if ($filter['is_valid'] == 0) {
					$qb->andWhere('dce.is_valid = 0');
				} elseif ($filter['is_valid'] == 1) {
					$qb->andWhere('dce.is_valid = 1');
				} else {
					$qb->andWhere('dce.is_valid IN (0,1)');
				}
			}
			if (isset($filter['date_created']) && !empty($filter['date_created']) && strtotime($filter['date_created']) !== false) {
				$qb->andWhere('dce.date_created ' . addcslashes($filter['date_created_operator'], '%_') . ' :date_created')
					->setParameter("date_created", DateTime::createFromFormat('d. m. Y', $filter['date_created'])->format('Y-m-d'));
			}
		}

		if(isset($sort)) {
			$qb->orderBy('dce.' . $sort, $by);
		}

		return $qb->getQuery();