According to the documentation on Symfony.com(1), the class named Gro…

…up should implements RoleInterface. However, when implementing ACLs, the code I modified would look for the Role class and therefore saves the Group as an object rather than saving the role name of the group. (1)http://symfony.com/doc/current/cookbook/security/entity_provider.html#managing-roles-in-the-database
symfony · http-teapot · May 17, 2012 · May 17, 2012 · 09d4488772e877e10fe762e17da1292b9f042235
commit 09d4488772e877e10fe762e17da1292b9f042235
diff --git a/src/Symfony/Component/Security/Acl/Domain/RoleSecurityIdentity.php b/src/Symfony/Component/Security/Acl/Domain/RoleSecurityIdentity.php
@@ -30,7 +30,7 @@ final class RoleSecurityIdentity implements SecurityIdentityInterface
      */
     public function __construct($role)
     {
-        if ($role instanceof Role) {
+        if ($role instanceof RoleInterface) {
             $role = $role->getRole();
         }