如何在FOSRestBundle / JMS Serializer中更改字段值？

Question

我在实体中有“图像”字段。但取决于我想要显示的不是原始图像，而是图像的预览（我在LiipImagineBundle中制作）。我能想象的一个解决方案：

public function cgetAction(Request $request)
{
    $events = $this->container->get('gc.event_manager')->getEvents();
    foreach ($events as &$event) {
        $previewURL = $this->getPreview($event->getPhoto());
        $event->setPhoto($previewURL);
    }
    $event = false;

    return array(
        'events' => $events,
    );
}

但我不喜欢它，因为如果一个实体拥有深层子实体，那么代码就会非常混乱。

怎么做正确？

Answer 1

当您想在使用LiipImagine和FOSRest时通过API返回绝对URL时的常见问题

将EE \ TYSBundle更改为您自己的代码，取自https://github.com/EE/TellYourStoryBundle/tree/develop

JMSSerializer处理程序服务，带有注入的缓存管理器以获取正确的前缀

ee_tys.serializer.filename_handler:
    class: EE\TYSBundle\Handler\FilenameHandler
    arguments:
        - "@liip_imagine.cache.manager"
    tags:
        - { name: 'jms_serializer.handler', type: Filename, format: json}

自定义文件名类型的处理程序

EE \ TYSBundle \处理器\ FilenameHandler.php

<?php

namespace EE\TYSBundle\Handler;

use EE\TYSBundle\Entity\Filename;
use JMS\Serializer\GraphNavigator;
use JMS\Serializer\Handler\SubscribingHandlerInterface;
use JMS\Serializer\VisitorInterface;
use Liip\ImagineBundle\Imagine\Cache\CacheManager;

class FilenameHandler implements SubscribingHandlerInterface
{

    function __construct(CacheManager $manager)
    {
        $this->manager = $manager;
    }


    public static function getSubscribingMethods()
    {
        return array(
            array(
                'direction' => GraphNavigator::DIRECTION_SERIALIZATION,
                'format' => 'json',
                'type' => 'Filename',
                'method' => 'serializeFilenameToJson',
            ),
        );
    }

    public function serializeFilenameToJson(VisitorInterface $visitor, Filename $filename, array $type)
    {
        // `tile` is a name of Imagine filter you want to apply
        return $this->manager->getBrowserPath($filename, 'tile', true);
    }
}

EE \ TYSBundle \实体\文件名

<?php

namespace EE\TYSBundle\Entity;

/**
 * Class Filename
 * @package EE\TYSBundle\Entity
 */
class Filename {

    /**
     * @var string
     */
    public $name;

    /**
     * @var string
     */
    public $extension;

    public function __construct($filename)
    {
        $parts = explode(".", $filename);

        $this->setName($parts[0]);

        $this->setExtension($parts[1]);

    }

    /**
     * @param mixed $extension
     * @return Media
     */
    public function setExtension($extension)
    {
        $this->extension = $extension;

        return $this;
    }

    /**
     * @return mixed
     */
    public function getExtension()
    {
        return $this->extension;
    }

    /**
     * @param mixed $name
     * @return Filename
     */
    public function setName($name)
    {
        $this->name = $name;
    }

    /**
     * @return mixed
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * @return string filename
     */
    public function __toString()
    {
        return join(".", array($this->name, $this->extension));
    }

}

使用自定义文件名类型

/**
 * @var string|null
 *
 * @ORM\Column(name="background_filename", type="string", length=255, nullable=true)
 *
 * @Serializer\Expose
 * @Serializer\Type("Filename")
 * @Serializer\SerializedName("background_uri")
 */
private $backgroundFilename;

从现在开始，您将获得带有绝对URL的background_uri到您的预览图像

Answer 2

一种可能的解决方案是定义Handler。

处理程序允许您更改单个类型/格式组合的序列化或反序列化过程。

就像是

class ImageHandler
{
    public function serialize(VisitorInterface $visitor, \FQCN\Image $image, array $type, Context $context)
    {
        // do some stuff

        return ...;
    }
}

并在services.yml注册

serializer.handler.image_handler:
    class: FQCN\Handler\ImageHandler
    arguments: []
    tags:
        - { name: "jms_serializer.handler", type: FQCN\AdvertImage, format: json, method: serialize }

Answer 3

如果我理解你的问题，你需要在序列化之前更正值，我认为手册可以帮助@Accessor

class User
{
    private $id;

    /** @Accessor(getter="getTrimmedName",setter="setName") */
    private $name;

    // ...
    public function getTrimmedName()
    {
        return trim($this->name);
    }

    public function setName($name)
    {
        $this->name = $name;
    }
}