How can I pass a full security roles list/hierarchy to a FormType class in Symfony2?

Question

I have a user edit form where I would like to administer the roles assigned to a user.

Currently I have a multi-select list, but I have no way of populating it with

Answer 1

In your controller

$editForm = $this->createForm(new UserType(), $entity, array('roles' => $this->container->getParameter('security.role_hierarchy.roles')));

In UserType :

$builder->add('roles', 'choice', array(
    'required' => true,
    'multiple' => true,
    'choices' => $this->refactorRoles($options['roles'])
))

[...]

public function getDefaultOptions()
{
    return array(
        'roles' => null
    );
}

private function refactorRoles($originRoles)
{
    $roles = array();
    $rolesAdded = array();

    // Add herited roles
    foreach ($originRoles as $roleParent => $rolesHerit) {
        $tmpRoles = array_values($rolesHerit);
        $rolesAdded = array_merge($rolesAdded, $tmpRoles);
        $roles[$roleParent] = array_combine($tmpRoles, $tmpRoles);
    }
    // Add missing superparent roles
    $rolesParent = array_keys($originRoles);
    foreach ($rolesParent as $roleParent) {
        if (!in_array($roleParent, $rolesAdded)) {
            $roles['-----'][$roleParent] = $roleParent;
        }
    }

    return $roles;
}