Symfony Seralizer doesn't serialize OneToOne relation / Doctrin Proxy - php

Question

I'm trying to serialize a Entity that has a OneToOne relation to a Image Entity.
When dumping the Entity I can see that the Image Entity is a Doctrine Proxy and not initialized.
It also doesn't show up in the JSON response when trying to access the Endpoint.
I've tried fetch="EAGER" with no success.
How do I go about serializing this to the "Expected Response" ?
Response:
[
{
"id": 7
}
]
Expected Response:
[
{
"id": 7,
"image": {
"webView": "someUrl"
}
}
]
Entity:
/**
* #ORM\Entity(repositoryClass=BatteryTypeRepository::class)
*/
class BatteryType
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*
* #Groups({"type"})
*/
private $id;
/**
* #ORM\OneToOne(targetEntity=Image::class, cascade={"persist", "remove"})
*
* #Groups({"type"})
*/
private $image;
/**
* #return Image|null
*/
public function getImage(): ?Image
{
return $this->image;
}
public function setImage(?Image $image): self
{
$this->image = $image;
return $this;
}
}
Image Entity:
/**
* #ORM\Entity(repositoryClass=ImageRepository::class)
* #ORM\EntityListeners({"App\EventSubscriber\ImageListener"})
*/
class Image
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
* #Groups({"type"})
*/
private $id;
/**
* #ORM\Column(type="string", length=255)
*/
private $filename;
/**
* Auto generated by entity listener
* #var string
*/
private $tempFilename;
/**
* #var File
* #Assert\Image()
* #Assert\NotBlank()
*/
private $file;
/**
* #var string
* #Groups({"type"})
*/
private $webView;
/** Getters & Setters */
}
ImageListener:
class ImageListener
{
/**
* #var S3FileManagerInterface
*/
private S3FileManagerInterface $fileManager;
public function __construct(S3FileManagerInterface $fileManager)
{
$this->fileManager = $fileManager;
}
public function postLoad(Image $image, LifecycleEventArgs $args): void
{
$image->setWebView(
$this->fileManager->getUrl($image->getFilename())
);
if (!$image->getTempFilename()) {
$image->setTempFilename($image->getFilename());
}
}
}
Controller:
public function getBatteryTypes(BatteryTypeRepository $batteryTypeRepository): Response
{
$batteryTypes = $batteryTypeRepository->findAll();
$view = $this->view($batteryTypes, Response::HTTP_OK);
$view->getContext()->setGroups(["type"]);
return $this->handleView($view);
}

Answer 1

In your Image entity, you have to add the #Groups({"type"}) annotation for the webView attribute.

Answer 2

My Problem apparently was just cache related