getCustomerGroupRepository example

$prices = $builder->select(['prices', 'attribute', 'customerGroup'])
                              ->from(Price::class, 'prices')
                              ->innerJoin('prices.customerGroup', 'customerGroup')
                              ->leftJoin('prices.attribute', 'attribute')
                              ->where('prices.articleDetailsId = ?1')
                              ->setParameter(1, $mainDetail->getId())
                              ->getQuery()
                              ->getArrayResult();

            foreach ($prices as $key => $price) {
                unset($price['id']);
                $price['customerGroup'] = $this->getCustomerGroupRepository()->find($price['customerGroup']['id']);
                $price['article'] = $mainDetail->getArticle();
                $prices[$key] = $price;
            }
            $mainData['prices'] = $prices;
        }
        if ($mapping['basePrice']) {
            $mainData['unit'] = $mainDetail->getUnit();
            $mainData['purchaseUnit'] = $mainDetail->getPurchaseUnit();
            $mainData['referenceUnit'] = $mainDetail->getReferenceUnit();
            $mainData['packUnit'] = $mainDetail->getPackUnit();
        }