public function configureSettings(OptionsResolver $resolver)
 {
     parent::configureSettings($resolver);
     $resolver->setDefaults(array('foo' => 'bar', 'groups' => true));
 }
 public function setDefaultSettings(OptionsResolverInterface $resolver)
 {
     parent::setDefaultSettings($resolver);
     $resolver->setDefaults(array('foo' => 'bar', 'groups' => true));
 }