Doesn't work on Symfony 3

[FlorianKlee]

In Symfony 3.4, the Symfony FileType PRE_SUBMIT event remove data submitted before Base64FileTransformer::reverseTransform call.

Someone tried to use it with Symfony 3.x ?

[thislg]

It works with Symfony 3.2 but not anymore with Symfony 3.4.

[gorkalaucirica]

This line in Symfony's FileType breaks the extension:

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Form/Extension/Core/Type/FileType.php#L58

Creating a new FormType using the transformer works though:

class Base64FileType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('name');
        $builder->add('value');
        $builder->add('mimeType');
        $builder->add('size');
        $builder->addViewTransformer(new Base64FileTransformer());
    }
}