最近，一段代码停止工作。我没有做任何改变，所以我不知道为什么。
代码如下：

$invites = $this->vault_em->getRepository('AppBundle:Invite\LocalInvite')->findBy([
    'active' => true,
]);

现在，它返回一个空数组，即使存在active=1的localinvite记录。
以下是原则Map：

/**
 * @ORM\Entity
 * @ORM\Table(name="invite")
 */
class LocalInvite extends Invite {

    //...

}

/**@ORM\MappedSuperclass */
abstract class Invite implements \JsonSerializable {

    /**@ORM\Column(type="boolean", options={"default": true}) */
    protected $active;

    //...

}

为了进行调试，我从调试日志中复制了正在执行的底层mysql查询：

SELECT t0.id AS id_1, t0.email AS email_2, t0.active AS active_3, t0.location AS location_4, t0.cohort_leadership AS cohort_leadership_5, t0.timezone AS timezone_6, t0.date_record_created AS date_record_created_7, t0.date_record_deleted AS date_record_deleted_8, t0.date_restart AS date_restart_9, t0.date_start_invite AS date_start_invite_10, t0.employee_id AS employee_id_11, t0.first_name AS first_name_12, t0.corporate_client_name AS corporate_client_name_13, t0.client_id AS client_id_14, t0.landing_page_url AS landing_page_url_15, t0.user_id AS user_id_16, t0.recipient_id AS recipient_id_17 FROM invite t0 WHERE t0.active = true;

当我将该查询插入mysql ide时，它会返回结果。
为什么findby不返回结果？