Symfony 3 - subform and element name - symfony

Question

I want to create form with composition pattern like this:
https://symfony.com/doc/current/form/inherit_data_option.html
I use Symfony 3.
and it's working. I have each element like single object and add this.
but finally my form elements names have name like
form[subform][element]
How to make flat structure without subform in name attribute?
use AppBundle\Base\Form\NickType;
use AppBundle\Base\Form\MailType;
use AppBundle\Base\Form\PassType;
use AppBundle\Base\Form\UserType;
class RegisterType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('nick', NickType::class)
->add('mail', MailType::class)
->add('password', PassType::class)
->add('repeat_password', PassType::class)
(etc...)
and SINGLE ELEMENT
class NickType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('nick', TextType::class);
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'inherit_data' => true
));
}
}

Answer 1

You don't need to define a NickType if it only inherits a TextType. You can remove NickType, MailType, etc.
You can just do:
class RegisterType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('nick', TextType::class)
;
(etc...)
If you want to reuse a form field, you have to create a Custom Form Field Type:
class NickType extends AbstractType
{
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
//...
));
}
public function getParent()
{
return TextType::class;
}
}
You can remove form[] from the element name, but removing this is not really recommended, because when you read the request to populate form data you can identify the form by its form name. (via)
You can set the name of the root form to empty, then your field name
will be just form. Do so via
// the first argument to createNamedBuilder() is the name
$form = $this->get('form.factory')->createNamedBuilder(null, 'form', $defaultData)
->add('from', 'date', array(
'required' => false,
'widget' => 'single_text',
'format' => 'dd.MM.yyyy'
));
(via)