使用 EventSubscriber 将函数的返回值作为属性传递给 json

Question

我已经使用 JMS 序列化包构建了一个 api。此外，我有一个实体Ticket，它有一个名为TicketRepository的存储库。此存储库包含以下方法：/** * @param Ticket $object * * @return string */public function findByTicketDeadline($object){  // some logic}我的目标：使用 EventSubscriber 将此函数的返回值传递给 json。这是我的类TicketSerializationSubscriber class TicketSerializationSubscriber implements EventSubscriberInterface{    /**     * @param ObjectEvent $event     */    public function onPostSerialize(ObjectEvent $event)    {        /** @var JsonSerializationVisitor $visitor */        $visitor = $event->getVisitor();        $visitor->setData('ticketDeadline', 'TEST TICKET'); // WORKS        /** @var Ticket $ticket */        $ticket = $event->getObject();        /** @var TicketRepository $ticketRepo */        $ticketRepo = $event->getObject();        $visitor->setData('TESTING', $ticketRepo->findByTicketDeadline($ticket));//        $visitor->setData('uri',//                $this->router->generate('ticket_api_show', [//                    'ticketDeadline' => $ticketRepo->findByTicketDeadline($ticket)//                ])//        );    }    public static function getSubscribedEvents()    {        return array(            array(                'event' => 'serializer.post_serialize',                'method' => 'onPostSerialize',                'class' => 'CMS3\CoreBundle\Entity\Ticket', // if no class, subscribe to every serialization                //'class' => 'CMS3\CoreBundle\Repository\TicketRepository', // if no class, subscribe to every serialization                'format' => 'json', // optional format                //'priority' => 0, // optional priority            ),        );    }}当我将存储库方法传递给 $visitor->setData() 函数时，出现此错误：

Answer 1

您当前的代码失败，因为$ticketRepo = $event->getObject();它返回的Ticket对象是它上面一行中的对象，而不是预期的TicketRepository.

您需要将EntityManageror Repository（如果您有存储库作为服务）注入您TicketSerializationSubscriber::__construct()的TicketRepository.

假设您已autowire启用包含TicketSerializationSubscriber.

use Doctrine\ORM\EntityManagerInterface;

class TicketSerializationSubscriber implements EventSubscriberInterface

{

    /**

     * @var \Doctrine\ORM\EntityManager

     */

    private $em;

    public function __construct(EntityManagerInterface $em)

    {

         $this->em = $em;

    }

    public function onPostSerialize(ObjectEvent $event)

    {

        /** @var JsonSerializationVisitor $visitor */

        $visitor = $event->getVisitor();

        $ticket = $event->getObject();

        if (!$ticket instanceof Ticket) {

            //ensure object is of expected type

            return;

        }

        /** @var TicketRepository $ticketRepo */

        $ticketRepo = $this->em->getRepository(Ticket::class);

        $visitor->setData('TESTING', $ticketRepo->findByTicketDeadline($ticket));

        //...

    }

    //...

}

如果不使用，autowire您将需要手动将其添加到您的TicketSerializationSubscriber服务声明参数中。

#app/config/services.yml

services:

    #...

    TicketSerializationSubscriber:

        public: false

        arguments: ['@doctrine.orm.entity_manager']

        tags:

            - { name: kernel.event_subscriber }

            #...

确保在进行更改后clear和warmupSymfony 缓存。