UserProfileSettingsType.php

<?php

namespace AppBundle\Form\Type;

use Symfony\Component\Form\AbstractType;
use AppBundle\Form\DataMapper\UserSettingDataMapper;

class UserProfileSettingsType extends AbstractType
{
    public function buildForm(FormBuilderInterface $build, array $options)
    {
        $builder->setDataMapper(new UserSettingDataMapper());
        $builder->add('locale', 'locale', array(
            'required' => false,
        ));
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'AppBundle\Entity\User',
        ));
    }

    public function getName()
    {
        return 'profile_settings';
    }
}