Symfony2: Can't create new entity with form - symfony

Question

I am having problem with creating new Collection entity with Form.
I want to create new Collection entity with form and then to be redirected to collections page with 'collection_user_collections' route, and be able to see new collection in user's collections list. But instead when I press submit button on form, I get following error:
No route found for "POST /profile/": Method Not Allowed (Allow: GET, HEAD)
Below is my code:
class Collection{
/**
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
private $name;
private $url;
private $type;
const STATUS_PRIVATE = 0;
const STATUS_PUBLIC = 1;
/**
* #ORM\ManyToOne(targetEntity="MyMini\UserBundle\Entity\User", inversedBy="collections")
* #ORM\JoinColumn(name="user_id", referencedColumnName="id")
*/
private $user;
private $date_created;
private $date_modified;
/* getters and setters are here*/
}
I am using CollectionType to build form:
class CollectionType extends AbstractType{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('name','text')
->add('type', 'choice', array('choices' => array(
Collection::STATUS_PRIVATE => 'Private',
Collection::STATUS_PUBLIC => 'Public',
)))
->add('save', 'submit', array('label' => 'Create Collection'))
;
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'MyMini\CollectionBundle\Entity\Collection'
));
}
public function getName()
{
return 'mymini_collectionbundle_collection';
}
}
This is createAction, here I tried to insert current user's username and date when entity was created. I am using FOSUserBundle to manage app users:
/**
* #Route("/create-collection/", name="collection_create_collection")
* #Template()
*/
public function createAction(Request $request)
{
$collection = new Collection();
$user = $this->get('security.token_storage')->getToken()->getUser();
$username = $user->getUsername();
$form = $this->createForm(new CollectionType(), $collection);
$form->handleRequest($request);
if ($form->isValid() && $form->isSubmitted()) {
$em = $this->getDoctrine()->getManager();
$collection->setUser($user);
$collection->setDateCreated(new \DateTime());
$em->persist($collection);
$em->flush();
return $this->redirectToRoute('collection_user_collections', array('username' => $username));
}
return array('collection'=>$collection, 'form' => $form->createView());
}
Twig for form:
<div class="collection-create">
<h3 id="create-collection">Create a collection</h3>
<a class="close-reveal-modal" aria-label="Close">×</a>
{{ form(form) }}
</div>

Answer 1

The exception you're receiving is expected. You are calling the createForm method without passing all necessary arguments. The right way to create a form is:
$this->createForm(
new CollectionType(),
$collection,
array(
'action' => $this->generateUrl('collection_create_collection') ),
'method' => 'PUT', // or 'POST'
)
);