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

You can make your own type and then pass service container, from which you can then retrieve role hierarchy.

First, create your own type:

class PermissionType extends AbstractType 
{
    private $roles;

    public function __construct(ContainerInterface $container)
    {
        $this->roles = $container->getParameter('security.role_hierarchy.roles');
    }
    public function getDefaultOptions(array $options)
    {
        return array(
              'choices' => $this->roles,
        );
    );

    public function getParent(array $options)
    {
        return 'choice';
    }

    public function getName()
    {
        return 'permission_choice';
    }
}

Then you need to register your type as service and set parameters:

services:
      form.type.permission:
          class: MyNamespace\MyBundle\Form\Type\PermissionType
          arguments:
            - "@service_container"
          tags:
            - { name: form.type, alias: permission_choice }

Then during creation of form, simply add *permission_choice* field:

public function buildForm(FormBuilder $builder, array $options)
{
    $builder->add('roles', 'permission_choice');
}

If you want to get only single list of roles without hierarchy, then you need to flat hierarchy somehow. One of possible solution is this:

class PermissionType extends AbstractType 
{
    private $roles;

    public function __construct(ContainerInterface $container)
    {
        $roles = $container->getParameter('security.role_hierarchy.roles');
        $this->roles = $this->flatArray($roles);
    }

    private function flatArray(array $data)
    {
        $result = array();
        foreach ($data as $key => $value) {
            if (substr($key, 0, 4) === 'ROLE') {
                $result[$key] = $key;
            }
            if (is_array($value)) {
                $tmpresult = $this->flatArray($value);
                if (count($tmpresult) > 0) {
                    $result = array_merge($result, $tmpresult);
                }
            } else {
                $result[$value] = $value;
            }
        }
        return array_unique($result);
    }
    ...
}