SCRUM#282: loop over role_ids; change of strategy return roles from users

app/serializers/user_serializer.rb

@@ -37,7 +37,9 @@ class UserSerializer < ActiveModel::Serializer
   end
 
   def role_ids
-    object.roles.all.ids
+    roles = []
+    object.roles.each { |role| puts roles << role.id }
+    roles
   end
 
   attributes \