Symfony 5 add field to form after form submit

Question

Lets assume I have the following form:

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('paste', TextareaType::class, [
            'attr' => array('rows' => '15'),
        ])
        ->add('language', ChoiceType::class, ['choices' => $this->languagesService->getSupportedLanguages()])
        ->add('visibility', ChoiceType::class, ['choices' => $this->visibilityService->getVisibilities()])
        ->add('expiresAt', ChoiceType::class, ['choices' => $this->expiryService->getExpiryTimes(), 'mapped' => false])
        ->add('name', TextType::class, ['required' => false])
        ->add('save', SubmitType::class, ['label' => 'Submit'])
    ;
}

Once the form is submitted I want to add another field to it that the user cannot complete. Lets call the field in question new_field.

So far I've tried using a form event:

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('paste', TextareaType::class, [
            'attr' => array('rows' => '15'),
        ])
        ->add('language', ChoiceType::class, ['choices' => $this->languagesService->getSupportedLanguages()])
        ->add('visibility', ChoiceType::class, ['choices' => $this->visibilityService->getVisibilities()])
        ->add('expiresAt', ChoiceType::class, ['choices' => $this->expiryService->getExpiryTimes(), 'mapped' => false])
        ->add('name', TextType::class, ['required' => false])
        ->add('save', SubmitType::class, ['label' => 'Submit'])
        ->addEventListener(FormEvents::POST_SUBMIT, function (FormEvent $event) {
            $form = $event->getForm();
            $form->add('new_field')->setData('some_data');
        })
    ;
}

And I obviously get an exception thrown my way: You cannot add children to a submitted form, which is fair enough.

Another thing I could do, which I very much don't want to do because it seems hacky is create a new entity in the controller, set the data I get from the form there and save it.

if ($form->isSubmitted() && $form->isValid()) {
    $formData = $form->getData();
    $entity = new Paste();
    $entity->setCreatedAt($formData->get('createdAt')->getData());
    ...

I could also create some generic parent to the form and modify that, but that seems even more hacky.

I'm not opposed to another approach here. Perhaps I'm looking at this wrong to begin with.

Youssef Saoubou · Accepted Answer · 2020-02-06 20:36:31Z

1

If you want to modify data, you should never call $form->setData() as this is handled internally.

->addEventListener(FormEvents::POST_SUBMIT, function (FormEvent $event) {
    $class= $event->getData();
    $class['new_field'] = 'some_data';
    $event->setData($class);
});

But you can use $event->setData() instead.

answered Feb 6, 2020 at 20:36

Youssef Saoubou

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1 Comment

user9206045 Over a year ago

If you check the docs, it recommends using FormEvents::PRE_SUBMIT to change data from the request Docs

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