我应该如何通过doctrine存储库查询中的鉴别器列进行排序？

我有一个非常直接的设置,我有不同类型的支付细节,它可以是信用卡(CC)或借记订单(DO).

所以我已经实现了单表继承映射策略来实现这一点,但是当我尝试通过鉴别器列进行排序时,问题就出现了,因为鉴别器列不存在于基类中.

存储库功能:

public function getPaymentDetails (ClientContactInterface $clientContact)
{
    $dql = 'SELECT pd
            from
            AccountingBundle:PaymentDetail pd
            JOIN ClientProductBundle:ClientProduct cp
            WITH cp.payment_detail_id = pd.id
            WHERE
            cp.payment_detail_id = pd.id
            and cp.client_contact_id = :client_contact_id
            GROUP BY pd.id
            ORDER BY pd.method_type'; // Since pd.method_type is the discriminator column, I cannot order by it. And I need to be able to.

    $em = $this->getEntityManager();
    $query = $em->createQuery($dql)->setParameter('client_contact_id', $clientContact->getId());
    return $query->getResult();
}

Base PaymentDetail实体:

/**
 * @ORM\Entity(repositoryClass="AccountingBundle\Repository\PaymentDetailRepository")
 * @ORM\InheritanceType("SINGLE_TABLE")
 * @ORM\Table(name="PaymentDetails")
 * @ORM\DiscriminatorColumn(name="PaymentMethodType", type="string")
 * …

当在下面运行DQL时,从doctrine 2中选择仅识别器列时,我需要一些帮助

SELECT p.type FROM AppBundle\Entity\Product p

type 是实体中的鉴别列 AppBundle\Entity\Product

@ORM\DiscriminatorColumn(name="type", type="smallint")`

@ORM\DiscriminatorMap({
    "0" = "AppBundle\Entity\Product",
    "1" = "AppBundle\Entity\Product\SingleIssue",
    "2" = "AppBundle\Entity\Product\CountBasedIssue",
    "3" = "AppBundle\Entity\Product\TimeBasedIssue"
})

我知道这type不是实体中的不动产,但无论如何我还能这样做吗？

提前致谢!

更新

阅读Doctrine代码2天后,我决定覆盖SqlWalker并通过下面的片段创建新的Hydrator

覆盖SqlWalker

<?php

namespace ...;

use Doctrine\ORM\Query\SqlWalker;

class CustomSqlWalker extends SqlWalker
{
    const FORCE_GET_DISCRIMINATOR_COLUMN = 'forceGetDiscriminatorColumn';
    const DISCRIMINATOR_CLASS_MAP = 'discriminatorClassMap';

    /**
     * {@inheritdoc}
     */
    public function walkSelectClause($selectClause)
    {
        $sql = parent::walkSelectClause($selectClause);
        $forceGetDiscriminatorColumn = $this->getQuery()->getHint(self::FORCE_GET_DISCRIMINATOR_COLUMN);
        if (empty($forceGetDiscriminatorColumn)) {
            return $sql;
        }

        foreach ($this->getQueryComponents() as $key => $queryComponent) {
            if (!in_array($key, …