Doctrine 2 WHERE IN 子句使用实体集合

I'm attempting to build a query in Doctrine 2 that finds all Vacancy entities which are related to any of the given VacancyWorkingHours entities.

Vacancy 实体如下所示:

/**
 * Vacancy
 *
 * @ORMTable(name="vacancy")
 * @ORMEntity(repositoryClass="JaikDeanCareersBundleEntityVacancyRepository")
 */
class Vacancy
{
    /**
     * @var integer
     *
     * @ORMColumn(name="id", type="integer")
     * @ORMId
     * @ORMGeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var VacancyWorkingHours
     *
     * @ORMManyToOne(targetEntity="VacancyWorkingHours", inversedBy="vacancies")
     * @ORMJoinColumn(name="vacancy_working_hours_id", referencedColumnName="id")
     **/
    private $workingHours;

    /* Other fields and methods are inconsequential */
}

我的查询当前如下所示，但由于 where 子句，没有返回任何结果.在此示例中，$workingHours 是一个 DoctrineCommonCollectionsArrayCollection 实例，其中包含许多 VacancyWorkingHours 实体

$q = $this->createQueryBuilder('v')
    ->select('v')
    ->andWhere('v.workingHours IN (:workingHours)')
    ->setParameter('workingHours', $workingHours->toArray());
;

$q = $this->createQueryBuilder('v')
    ->select('v')
    ->andWhere('v.workingHours IN (:workingHours)')
    ->setParameter('workingHours', $workingHours);
;