protected function getOneQueryBuilder($alias = null, $indexBy = null)
    {
        return $this
            ->createQueryBuilder($alias, $indexBy)
            ->select(
                $alias,
                'customer',
                'customer_group',
                'invoice_address',
                'delivery_address',
                'shipment_method',
                'currency'
            )
            ->leftJoin($alias . '.customer', 'customer')
            ->leftJoin($alias . '.customerGroup', 'customer_group')
            ->leftJoin($alias . '.invoiceAddress', 'invoice_address')
            ->leftJoin($alias . '.deliveryAddress', 'delivery_address')
            ->leftJoin($alias . '.shipmentMethod', 'shipment_method')
            ->leftJoin($alias . '.currency', 'currency')
            ->setMaxResults(1);
    }
protected function getOneQueryBuilder($alias = null, $indexBy = null)
    {
        return $this
            ->createQueryBuilder($alias, $indexBy)
            ->select(
                $alias,
                'customer',
                'customer_group',
                'invoice_address',
                'delivery_address',
                'shipment_method',
                'currency'
            )
            ->leftJoin($alias . '.customer', 'customer')
            ->leftJoin($alias . '.customerGroup', 'customer_group')
            ->leftJoin($alias . '.invoiceAddress', 'invoice_address')
            ->leftJoin($alias . '.deliveryAddress', 'delivery_address')
            ->leftJoin($alias . '.shipmentMethod', 'shipment_method')
            ->leftJoin($alias . '.currency', 'currency')
            ->setMaxResults(1);
    }
Returns the "find one result" query builder.

@param string $alias
@param string $indexBy

@return \Doctrine\ORM\QueryBuilder