Form does not display form errors in template - symfony

Question

For my contact form no form errors are displayed.
$contact = new Contact();
$form = $this->createForm(new ContactFormType(), $contact);
/* handle contact form submission */
if ('POST' == $request->getMethod()) {
$form->bindRequest($request);
if ($form->isValid()) {
//Do something
}
}
return $this->render('MainBundle:Default:contact.html.twig', array(
'form' => $form->createView()
));
My validator
Fc\MainBundle\Entity\Contact:
properties:
firstName:
- NotBlank: ~
lastName:
- NotBlank: ~
email:
- NotBlank: ~
- Email:
checkMX: true
title:
- NotBlank: ~
message:
- NotBlank: ~
I have added a novalidate attribute to my form tag to check if my validation works. Now when I submit the form with empty data nothing happens (with correct data everything is fine), the controller identifies the form as invalid and stops further processes.
In the template I call
{{ form_errors(form) }}
But nothing is displayed. Any ideas why? I use symfony 2.1.X

Answer 1

Can you confirm that the validation is working with this:
if ($form->isValid()) {
//Do something
}
else
{ die('not valid') }
Is the form well posted?
Is there anything in the HTML that shows up where you call {{ form_errors(form) }} ? - it would be a CSS or JS problem if that's the case...
Have you tried to show the errors by field (there is no global error in your validation apparently):
{{ form_errors(form.firstName) }}
etc.
Remark: form.firstName works, not form.first_name. You have to follow that convention with Doctrine2/Symfony2.