Merge branch 'issue/282' into 'master'

Issue/282

See merge request portalmec/portalmec!464

app/serializers/user_serializer.rb

-
 # Copyright (C) 2015 Centro de Computacao Cientifica e Software Livre
 # Departamento de Informatica - Universidade Federal do Parana
 #
@@ -37,7 +36,9 @@ class UserSerializer < ActiveModel::Serializer
   end
 
   def role_ids
-    object.roles.all.ids
+    roles = []
+    object.roles.each { |role| roles << role.id }
+    roles
   end
 
   attributes \