Cannot create dropdown to select user roles with FOSUserBundle - symfony

Question

I'm developing the Admin Panel for my website, and one part of it is managing users. I'm using FOSUserBundle for those tasks.
I'm using custom template (AdminLTE) for forms, and I cannot add a dropdown to select roles for user when I add a new one.
In UserType.php
$builder->add('roles', 'choice', array(
'label' => 'User Role',
'choices' => $this->roleHelper->getRolesForForm()
));
In WCB\SaleBundle\Helper\RoleHelper.php
...
public function getRolesForForm()
{
$roleList = self::flatArray($this->rolesHierarchy);
$roles = array();
foreach ($roleList as $roleId => $roleName) {
if ($roleId == 'ROLE_ADMIN') {
$roles[$roleName] = 'Admin';
}
if ($roleId == 'ROLE_USER') {
$roles[$roleName] = 'User';
}
}
return $roles;
}
...
Above getRolesForForm() function will return this array, which is correct format for using with Symfony's choice field type:
Array
(
[ROLE_ADMIN] => Admin
[ROLE_USER] => User
)
And the form's not working anymore, with this exception:
The value of type "array" cannot be converted to a valid array key.
When I add 'multiple' = true to form builder, it works, but it's not a dropdown. It's HTML select box which allow multiple selection.
$builder->add('roles', 'choice', array(
'label' => 'User Role',
'choices' => $this->roleHelper->getRolesForForm(),
'multiple' => true
));
I think, for role selection, it should be a dropdown, not a multiple-selection box. How can I achieve this? Anything wrong with my code? Thank you :)

Answer 1

I think it should be a multiple-selection box indeed.
Take into account that a user can (and usually will) have several roles. In your case, a user who has ROLE_ADMIN also has ROLE_USER (ROLE_ADMIN "includes" ROLE_USER if you are using FOSUserBundle).

Answer 2

Not really sure if this may be the problem since I don't have your full code and I am not sure what self::flatArray($this->rolesHierarchy) is returning but please notice that you are using $roleName, not $roleId as your array key. If $roleName is not a string then you will get this problem.

Answer 3

I faced same issue lately and this is my work around (I created DataTransformer):
class UserType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
...
$builder->get('roles')->addModelTransformer(new RolesTransformer());
}
}
And DataTransformer class:
use AppBundle\Entity\User;
use Symfony\Component\Form\DataTransformerInterface;
class RolesTransformer implements DataTransformerInterface
{
public function transform($roles)
{
foreach ($roles as $role) {
if ($role !== User::ROLE_DEFAULT) {
return $role;
}
}
return $roles[0];
}
public function reverseTransform($string)
{
return [
$string, User::ROLE_DEFAULT
];
}
}

Answer 4

The role attribute from UserModel of FOSUserBundle expected an array. If you use a select normal, they don't return an array.