Symfony2 form field not updated when validation error occurs

Question

Here is my form type:

class TestFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {

        $         


        

Answer 1

I cannot exactly solve your problem, because in my opinion you're doing it the wrong way. A data class is actually only responsibly for keeping your data, so your method set/getThumbnailData should look like this

thumbnailData = $thumbnailData;
}

public function getThumbnailData() {
    return $this->thumbnailData;
}

In your controller you have something like this:

handleRequest($request);
    if($form->isValid()) {
        $test = $form->getData();
        /* @var $test Test */
        $thumbnailUploader = $this->get('thumbnail_uploader');
        /* @var $thumbnailUploader ThumbnailUploadService */

        $file = $test->getThumbnailData();
        $filename = $file->getClientOriginalName();
        $thumbnailUploader->upload($filename, $file);

        // ...
    }
}

I recommend to move all logic which has nothing to do with forms or requests into services. Your service in this case can be more generic handle any symfony files with a given filename.