Doesn't save the image in the database Symfony 4 - file-upload

Question

I'm writing applications in symfony and I would like to add an image to the article. I can't save the image to the database. I am trying to make an example from the documentation: https://symfony.com/doc/current/controller/upload_file.html
The image is uploaded to the directory on the server and isn't saved to the database.
$post->setThumbnail($fileName); sets the image name correctly
Entity
/**
* #Assert\Image(
* minWidth = 500,
* minHeight = 300,
* maxWidth = 1920,
* maxHeight = 1080,
* maxSize = "1M"
* )
*/
private $thumbnail;
/**
* Set thumbnail.
*
* #param string $thumbnail
*
* #return Post
*/
public function setThumbnail($thumbnail)
{
$this->thumbnail = $thumbnail;
return $this;
}
/**
* Get thumbnail.
*
* #return string
*/
public function getThumbnail()
{
return $this->thumbnail;
}
Action in Controller
/**
* Add and Edit page Post.
*
* #Route(
* {"pl": "/artykyl/{slug}"},
* name="panel_post",
* defaults={"slug"=NULL}
* )
*
* #param Request $request
* #param string|null $slug
* #param TranslatorInterface $translator
*
* #return \Symfony\Component\HttpFoundation\RedirectResponse|\Symfony\Component\HttpFoundation\Response
*/
public function post(Request $request, string $slug = null, TranslatorInterface $translator, FileUploader $fileUploader)
{
if (null === $slug) {
$post = new Post();
$newPostForm = true;
} else {
$post = $this->getDoctrine()->getRepository('App\Entity\Post')->findOneBy(['slug' => $slug]);
}
$form = $this->createForm(PostType::class, $post);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
if ($post->getThumbnail()) {
$file = $post->getThumbnail();
$fileName = $fileUploader->upload($file);
$post->setThumbnail($fileName);
}
$em = $this->getDoctrine()->getManager();
$em->persist($post);
$em->flush();
$this->addFlash('success', $translator->trans('Changes have been saved'));
return $this->redirectToRoute('panel_post', ['slug' => $post->getSlug()]);
} elseif ($form->isSubmitted() && false === $form->isValid()) {
$this->addFlash('danger', $translator->trans('Corrects form'));
}
return $this->render('backend/blog/post.html.twig', [
'currPage' => 'posts',
'form' => $form->createView(),
'post' => $post,
]);
}
File Uploader
class FileUploader
{
private $targetDirectory;
public function __construct($targetDirectory)
{
$this->targetDirectory = $targetDirectory;
}
public function upload(UploadedFile $file)
{
$fileName = md5(uniqid()).'.'.$file->guessExtension();
try {
$file->move($this->getTargetDirectory(), $fileName);
} catch (FileException $e) {
// ... handle exception if something happens during file upload
}
return $fileName;
}
public function getTargetDirectory()
{
return $this->targetDirectory;
}
}
Listener ThumbnailUploadListener
class ThumbnailUploadListener
{
private $uploader;
public function __construct(FileUploader $uploader)
{
$this->uploader = $uploader;
}
public function prePersist(LifecycleEventArgs $args)
{
$entity = $args->getEntity();
$this->uploadFile($entity);
}
public function preUpdate(PreUpdateEventArgs $args)
{
$entity = $args->getEntity();
$this->uploadFile($entity);
}
private function uploadFile($entity)
{
// upload only works for Post entities
if (!$entity instanceof Post) {
return;
}
$file = $entity->getThumbnail();
// only upload new files
if ($file instanceof UploadedFile) {
$fileName = $this->uploader->upload($file);
$entity->setThumbnail($fileName);
} elseif ($file instanceof File) {
// prevents the full file path being saved on updates
// as the path is set on the postLoad listener
$entity->setThumbnail($file->getFilename());
}
}
public function postLoad(LifecycleEventArgs $args)
{
$entity = $args->getEntity();
if (!$entity instanceof Post) {
return;
}
if ($fileName = $entity->getThumbnail()) {
$entity->setPost(new File($this->uploader->getTargetDirectory().'/'.$fileName));
}
}
}
services.yaml
App\EventListener\ThumbnailUploadListener:
tags:
- { name: doctrine.event_listener, event: prePersist }
- { name: doctrine.event_listener, event: preUpdate }
- { name: doctrine.event_listener, event: postLoad }

Answer 1

You forgot about mapping the thumbnail field
#ORM\Column(type="string")