Editing Symfony Forms Cookbook (section)

=== Form classes ===

The convention is to put form classes in `src/AppBundle/Form/Type/`.

<syntaxhighlight lang="php">
// src/AppBundle/Form/Type/TaskType.php
namespace AppBundle\Form\Type;

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

class TaskType extends AbstractType
{
	public function buildForm(FormBuilderInterface $builder, array $options)
	{
		$builder
			->add('task')
			->add('dueDate', null, array('widget' => 'single_text'))
			->add('save', 'submit');
	}

	public function setDefaultOptions(OptionsResolverInterface $resolver)
	{
		$resolver->setDefaults(array(
			'data_class' => 'AppBundle\Entity\Task',
		));
	}

	public function getName()
	{
		return 'task';
	}
}
</syntaxhighlight>

`getName()` should return a unique identifier to be used by the controller.

To use the form class in the controller:

<syntaxhighlight lang="php" highlight="4,9">
// src/AppBundle/Controller/DefaultController.php

// add this new use statement at the top of the class
use AppBundle\Form\Type\TaskType;

public function newAction()
{
    $task = ...;
    $form = $this->createForm(new TaskType(), $task);

    // ...
}
</syntaxhighlight>