Symfony2 non mapped collectionType not working

Question

I am using the method explained here to implement multiple file upload, but it can't find a way to make it work. I know there is already a lot of questions about it, but I couldn't find a suitable answer for my case.

Note that I am storing file's content in the database, thanks to a file Entity with Name, Content and Type attributes. However in order to make it work, I am not mapping the form to this entity.

So, my controller looks like this :

    $files = [];

    $form = $this->createForm(MultipleFilesType::class, []);

    $form->handleRequest($request);

    if ($form->isSubmitted() && $form->isValid()) {

        $files = $form->getData();

        dump($files);

        foreach ($files as $file)
        {
            //code that stores the file in the database which works fine and is not relevant to my problems I think
        }
        return // redirect to some page
    }

    return //form to the view

My MultipleFilesType is the collection which embed multiple addFileType :

class MultipleFilesType extends AbstractType
{
/**
 * @param FormBuilderInterface $builder
 * @param array $options
 */
public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('files', CollectionType::class, array (
            'entry_type' => addFileType::class,
            'allow_add' => true,
            'allow_delete' => true,
            'label' => false,
            'mapped' => false,
            'data' => array(
               array ('file' => null)
            )
        ))
    ;
}
}

and my addFileType is this :

class AddFileType extends AbstractType
{


/**
 * @param FormBuilderInterface $builder
 * @param array $options
 */
public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('file', FileType::class, array (
            'label' => false
        ))
    ;

}
}

In my view I can add / remove fields thanks to some JQuery explained in the linked documentation. (The code is more or less the same as the one in the doc, except that I am not working with Entites, so I am not showing it here).

I first tried to do single file uploads, which worked nicely, and then I tried the above code, using the collectionType and a $files array to retrieve the data from the form to the controller, but I am having these issues :

When I submit the form, apparently the values of files after the first one are not valid.

When I submit only one file (no validation error), the dump($files) in the controller show me an empty array no matter what.

Any help would be appreciated =) Don't hesitate to ask for more code if you think it is needed.

Thank you !

Answer 1

Instead of

$files = $form->getData();

it was

$files = $form->get("files")->getData();