<?php
/**
 * @author    Igor Nikolaev <igor.sv.n@gmail.com>
 * @copyright Copyright (c) 2015, Darvin Studio
 * @link      https://www.darvin-studio.ru
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Darvin\Utils\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Validator\Constraints\Blank;

/**
 * Anti-spam form type
 */
class AntiSpamType extends AbstractType
{
    const ANTI_SPAM_TYPE_CLASS = __CLASS__;

    /**
     * {@inheritdoc}
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'label'       => false,
            'attr'        => array(
                'class' => 'title_field',
            ),
            'constraints' => new Blank(),
            'mapped'      => false,
            'required'    => false,
        ));
    }

    /**
     * {@inheritdoc}
     */
    public function getParent()
    {
        return 'text';
    }

    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return 'darvin_utils_anti_spam';
    }
}

<?php
/**
 * @author    Igor Nikolaev <igor.sv.n@gmail.com>
 * @copyright Copyright (c) 2015, Darvin Studio
 * @link      https://www.darvin-studio.ru
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Darvin\Utils\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Validator\Constraints\Blank;

/**
 * Anti-spam form type
 */
class AntiSpamType extends AbstractType
{
    const ANTI_SPAM_TYPE_CLASS = __CLASS__;

    /**
     * {@inheritdoc}
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'label'       => false,
            'attr'        => array(
                'class' => 'title_field',
            ),
            'constraints' => new Blank(),
            'mapped'      => false,
            'required'    => false,
        ));
    }

    /**
     * {@inheritdoc}
     */
    public function getParent()
    {
        return 'text';
    }

    /**
     * {@inheritdoc}
     */
    public function getBlockPrefix()
    {
        return 'darvin_utils_anti_spam';
    }
}

Replace method getName() in form types with "getBlockPrefix()".
Replace method getName() in form types with "getBlockPrefix()".
