Form mapped to class by different name - symfony

Question

I would like to associate my class with the forms. Is it possible that I gave different names for forms than they are in the class? For example class have property username but I would like to be mapped in the form to input of id login
use Symfony\Component\Form\FormBuilderInterface;
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('login', 'text', array (
'label' => 'Login'
)) //<- different name mapped by login
;
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'AppBundle\Entity\User',
));
}
User entity:
class User {
protected username;
//...
}

Answer 1

Yes. You are looking for property_path. See http://symfony.com/doc/2.8/reference/forms/types/form.html#property-path
$builder->add('login', 'text', array(
'label' => 'Login',
'property_path' => 'username',
));

Answer 2

Yes you can. Add 'mapped' => false option to the field which you want to have different name than it is in entity. This tells symfony that when the form will be submitted, it would not try to map that field to entity. But here, you will need to do additional work - 1. add data from entities username property to the unmapped one, and 2. when submitting the form, map manually submitted login data to the username property. These steps can be done via Form Events, like this:
use Symfony\Component\Form\FormBuilderInterface;
public function buildForm(FormBuilderInterface $builder, array $options)
{
// Set other fields...
$builder->addEventListener(FormEvents::PRE_SET_DATA, [$this, 'onPreSetData']);
}
function onPreSetData(FormEvent $event)
{
$form = $event->getForm(); // The form
$data = $event->getData(); // It will be User entity
$form
->add('login', 'text', array (
'label' => 'Login',
'mapped' => false,
'data' => $data->getUsername(),
));
}
function onPostSubmit(FormEvent $event)
{
$data = $event->getData();
$form = $event->getForm();
$data->setUsername($form->get('login')->getData());
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'AppBundle\Entity\User',
));
}
I'm not sure why you want to do this, but I showed you one way of doing this. Another and simplier way like qooplmao commented would be using property_path.