No options are passed to getParent() of FormTypeInterface anymore.

[pawaclawczyk]

• No options are passed to getParent() of FormTypeInterface anymore. If you previously dynamically inherited from FormType or FieldType, you can now dynamically set the "compound" option instead.

  Before:

  public function getParent(array $options)
  {
    return $options['expanded'] ? 'form' : 'field';
  }

  After:

  use Symfony\Component\OptionsResolver\OptionsResolverInterface;
  use Symfony\Component\OptionsResolver\Options;
  
  public function setDefaultOptions(OptionsResolverInterface $resolver)
  {
    $compound = function (Options $options) {
        return $options['expanded'];
    };
  
    $resolver->setDefaults(array(
        'compound' => $compound,
    ));
  }
  
  public function getParent()
  {
    return 'form';
  }

  The new method setDefaultOptions is described in the section "Deprecations".