hydratePriceGroup example

->andWhere('priceGroupDiscount.customergroupID = :customerGroup')
            ->groupBy('priceGroupDiscount.id')
            ->orderBy('priceGroupDiscount.groupID')
            ->addOrderBy('priceGroupDiscount.discountstart')
            ->setParameter(':customerGroup', $customerGroup->getId());

        $data = $query->execute()->fetchAll(PDO::FETCH_GROUP);

        $priceGroups = [];

        foreach ($data as $row) {
            $priceGroup = $this->priceHydrator->hydratePriceGroup($row);

            foreach ($priceGroup->getDiscounts() as $discount) {
                $discount->setCustomerGroup($customerGroup);
            }

            $priceGroups[$priceGroup->getId()] = $priceGroup;
        }

        return $priceGroups;
    }
}