How to pass saved data to a field in Symfony?

Question

symfony

I have a POST entity with a cover field that contains an entity - a picture

//src/Entity/Post.php
/**
     * @var Image
     * @ORM\ManyToOne(targetEntity="Image", cascade={"persist"})
     * @ORM\JoinColumn(name="cover_id", referencedColumnName="id")
     **/
    private $cover;

And when I edit the POST with a simple function:

//src/Controller/PostController.php
  /**
     * @Route("/{id}/edit", name="post_edit", methods={"GET","POST"})
     */
    public function edit(Request $request, Post $post): Response
    {
        $form = $this->createForm(PostType::class, $post);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            $this->getDoctrine()->getManager()->flush();

            return $this->redirectToRoute('post_index');
        }

        return $this->render('post/edit.html.twig', [
            'post' => $post,
            'form' => $form->createView(),
        ]);
    }

And forms:

//src/Form/PostType.php
class PostType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('cover', ImageType::class, array(
                'label' => 'Cover'
            ));
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => Post::class
        ]);
    }
}

//src/Form/ImagetType.php

class ImageType extends FileType
{
    private $imagePath;
    /**
     * ImageType constructor.
     * @param $imagePath
     */
    public function __construct($imagePath)
    {
        $this->imagePath = $imagePath;
    }

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        parent::buildForm($builder, $options);
        $builder->addModelTransformer(new CallbackTransformer(
            function(Image $image = null) {
                if ($image instanceof Image) {
                    return new File($this->imagePath . '/' . $image->getFile());
                }
            },
            function(UploadedFile $uploadedFile = null) {
                if ($uploadedFile instanceof UploadedFile) {
                    $image = new Image();
                    $image->setFile($uploadedFile);
                    return $image;
                }
            }
        ));
    }

    public function getBlockPrefix()
    {
        return 'image';
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        parent::configureOptions($resolver);
        $resolver->setDefaults([
            'required' => false
        ]);
    }
}

Then when submitting the form, the cover field (even if it is filled in for the object) comes empty. How to make it so that when editing other fields of the Post entity, if there is something in the cover, so that it is saved?
File upload borrowed from here - https://github.com/cirykpopeye/easy-image-uploadin...

Answer 1

You can do "->add('cover', ... " only on the create form, not on the edit form.
You can use $options to do this.