diff --git a/app/models/document.rb b/app/models/document.rb
index d4a89ff..764dea7 100644
--- a/app/models/document.rb
+++ b/app/models/document.rb
@@ -42,7 +42,9 @@ class Document < ActiveRecord::Base
   def initialize(attributes=nil, *args)
     super
     if new_record?
-      self.category ||= DocumentCategory.default
+      # Rails3 use this instead
+      # self.category ||= DocumentCategory.default
+      self.category_id = DocumentCategory.default.id if self.category_id == 0
     end
   end