my entity does not update throw a form - php

Question

I have an entity "group", with a name and a description.
I created a form for update both, but when I click on submit, values are set to NULL.
I also tried to create a new entity. But in this case, their value are set to default value in the field.
Here's my code :
my form :
<form method="post" class="form-signin" {{ form_enctype(form) }}>
<input id="name" name="form[name]" required="required" value="{{ group.name }}"></input>
<textarea id="description" name="form[description]" >{{ group.description }}</textarea>
<input class="btn btn-lg btn-primary btn-block" type="submit" id="_submit" name="_submit" value="submit" />
</form>
my controller :
public function updateParametersAction()
{
$user = $this->get('security.context')->getToken()->getUser();
$repository = $this->getDoctrine()
->getManager()
->getRepository('MyBundle:Groups');
$group = $repository->findOneByIdUser($user->getId());
$form = $this->createFormBuilder($group)
->add('name', 'text')
->add('description', 'textarea')
->getForm();
$request = $this->get('request');
if ($request->getMethod() == 'POST') {
$em = $this->getDoctrine()->getManager();
$em->persist($group);
$em->flush();
}
return $this->render('MyBundle:Client:updateParameters.html.twig', array(
'group' => $group,
'form' => $form->createView()
));
}
What's wrong ?

Answer 1

You have to bind a request to the form:
// (...)
$form = $this->createFormBuilder($group)
->add('name', 'text')
->add('description', 'textarea')
->getForm();
$form->handleRequest($request);
// (...)