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

The solution with $options array provided by webda2l does not work with Symfony 2.3. It gives me an error:

The option "roles" do not exist.

I found that we can pass parameters to the form type constructor.

In your controller :

$roles_choices = array();

$roles = $this->container->getParameter('security.role_hierarchy.roles');

# set roles array, displaying inherited roles between parentheses
foreach ($roles as $role => $inherited_roles)
{
    foreach ($inherited_roles as $id => $inherited_role)
    {
        if (! array_key_exists($inherited_role, $roles_choices))
        {
            $roles_choices[$inherited_role] = $inherited_role;
        }
    }

    if (! array_key_exists($role, $roles_choices))
    {
        $roles_choices[$role] = $role.' ('.
            implode(', ', $inherited_roles).')';
    }
}

# todo: set $role as the current role of the user

$form = $this->createForm(
    new UserType(array(
        # pass $roles to the constructor
        'roles' => $roles_choices,
        'role' => $role
    )), $user);

In UserType.php :

class UserType extends AbstractType
{
    private $roles;
    private $role;

    public function __construct($options = array())
    {
        # store roles
        $this->roles = $options['roles'];
        $this->role = $options['role'];
    }
    public function buildForm(FormBuilderInterface $builder,
        array $options)
    {
        // ...
        # use roles
        $builder->add('roles', 'choice', array(
            'choices' => $this->roles,
            'data' => $this->role,
        ));
        // ...
    }
}

I took the idea from Marcello Voc, thanks to him!