Symfony 2 Doctrime 2 and form validate ( unique field ) - forms

Question

Hello I have small problem. I've never done form validator in sf2 so I don't know where I should start. I have one field 'username' and it is unique in database so how can I try it?
My Code :
-> ENTITY
/**
* #var string $nick_allegro
*
* #ORM\Column(name="nick_allegro", type="string", length=255, unique=true, nullable=true)
*/
private $nick_allegro;
-> FORM
public function buildForm(FormBuilder $builder, array $options)
{
$builder
->add('nick_allegro')
;
}
public function getDefaultOptions(array $options) {
return array(
'data_class' => 'My\FrontendBundle\Entity\Licence',
);
}
-> Controller
/**
* Displays a form to create a new Licence entity.
*
* #Route("/new", name="licence_new")
* #Template()
*/
public function newAction()
{
$entity = new Licence();
$form = $this->createForm(new LicenceType(), $entity);
return array(
'entity' => $entity,
'form' => $form->createView()
);
}
/**
* Creates a new Licence entity.
*
* #Route("/create", name="licence_create")
* #Method("post")
* #Template("MyFrontendBundle:Licence:new.html.twig")
*/
public function createAction()
{
$entity = new Licence();
$request = $this->getRequest();
$form = $this->createForm(new LicenceType(), $entity);
$form->bindRequest($request);
if ($form->isValid()) {
$em = $this->getDoctrine()->getEntityManager();
$em->persist($entity);
$em->flush();
return $this->redirect($this->generateUrl('licence_show', array('id' => $entity->getId())));
}
return array(
'entity' => $entity,
'form' => $form->createView()
);
}
-> View
<form action="{{ path('licence_create') }}" method="post" {{
form_enctype(form) }}>
{{ form_widget(form) }}
<p>
<button type="submit">Create</button>
</p> </form>

Answer 1

You need to use Unique Entity in symfony to validate that a particular field in a model is unique.
To help you a little bit (if you have a field called nick):
1/ In your entity
use Symfony\Component\Validator\Constraints as Assert;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
/**
* #ORM\Entity
* #UniqueEntity("nick")
*/
class User
{
/**
* #var string $email
*
* #ORM\Column(name="nick", type="string", length=255, unique=true)
*/
private $nick;
Validation will directly take effect as you asserted the constraints in your entity..
Therefore, you can already check the validaiton in your controller.
2/ In your controller
if ( 'POST' === $request->getMethod()) {
$form->bind($request);
if ($form->isValid())
{
//do something if the form is valid
}
}

Answer 2

It's very simple. Enough add in file Entity #ORM\Column this "unique=true"
Example:
class User
{
/**
* #var string $email
*
* #ORM\Column(name="email", type="string", length=255, unique=true)
* #Assert\Email()
*/
protected $email;
}

Answer 3

Bear in mind that form handling in sf2.1 changed a little bit, so be sure to check the right documentation:
Forms in sf 2.1
Forms in sf 2.0
How to upgrade from 2.0 to 2.1 - Form chapter
Validation is done in many ways, among the others with annotations over entity fields, and in your case you need the UniqueEntity annotation.
Be sure to check all the symfony2 docs online because it's the best way to get into the matter.