Form class with Pomm & Silex

app1.php

<?php

// ...


        $app->get('/{slug}', function($slug) use ($app) {
            $post = $app['pomm.connection']
                ->getMapFor('Model\SoniaCosta\Sc\Post')
                ->findBySlugWithComments($slug)
                ;

            if (!$post)
            {
                return new Response(sprintf("No such post '%s'.", $slug), 404);
            }

            $form_view = $app['form.factory']
                ->createBuilder(new \Form\Comment())
                ->getForm()
                ->createView();

            return $app['twig']->render("show_post.html.twig", array('post' => $post, 'comment_form' => $form_view));
        })->bind('post_show');

app2.php

<?php

// ...

        $app->post('/{slug}/comment/add', function($slug) use ($app) {
            $post = $app['pomm.connection']
                ->getMapFor('Model\SoniaCosta\Sc\Post')
                ->findBySlugWithComments($slug)
                ;

            if (!$post)
            {
                return new Response(sprintf("No such post '%s'.", $slug), 404);
            }

            $form = $app['form.factory']
                ->createBuilder(new \Form\Comment())
                ->getForm()
                ->bind($app['request']);

            if ($form->isValid())
            {
                $values = $form->getData();
                $values['post_slug'] = $post->getSlug();
                $comment = $app['pomm.connection']
                    ->getMapFor('Model\SoniaCosta\Sc\Comment')
                    ->createAndSaveObject($values);

                return $app->redirect($app['url_generator']->generate('post_show', array('slug' => $post->getSlug())));
            }

            return $app['twig']->render("show_post.html.twig", array('post' => $post, 'comment_form' => $form->createView()));
        })->bind('new_comment');

Comment.php

<?php // sources/lib/Form/Comment.php

namespace Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
use Symfony\Component\Validator\Constraints;

class Comment extends AbstractType 
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        return $builder->add('author_name', 'text', array('constraints' => new Constraints\NotBlank(array('message' => 'Champs obligatoire'))))
            ->add('author_email', 'text', array('constraints' => array(new Constraints\NotBlank(array('message' => 'Champs obligatoire')), new Constraints\Email(array('message' => 'Email invalide')))))
            ->add('author_website', 'text', array('constraints' => array(new Constraints\Url(array('message' => 'URL invalide')))))
            ->add('title', 'text', array('constraints' => new Constraints\NotBlank(array('message' => 'Champs obligatoire'))))
            ->add('content', 'textarea', array('constraints' => new Constraints\NotBlank(array('message' => 'Champs obligatoire'))));
    }

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