CakePHP 3.0 Contact form

ContactForm.php

<?php

namespace App\Form;

use Cake\Form\Form;
use Cake\Form\Schema;
use Cake\Validation\Validator;

/**
 * Description of ContactForm
 *
 * @author duanlq
 */
class ContactForm extends Form {

    protected function _buildSchema(Schema $schema) {
        return $schema->addField('name', 'string')
                        ->addField('email', ['type' => 'string'])
                        ->addField('body', ['type' => 'text']);
    }

    protected function _buildValidator(Validator $validator) {
        return $validator->add('name', 'length', [
                    'rule' => ['minLength', 10],
                    'message' => 'A name is required'
                ])->add('email', 'format', [
                    'rule' => 'email',
                    'message' => 'A valid email address is required',
        ]);
    }

    protected function _execute(array $data) {
        mail('[email protected]', 'test', 'ok');
        return true;
    }

}