Added radio buttons on the documents list to sort documents by category, date, title or author.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@879 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/enumeration.rb

@@ -47,6 +47,10 @@ class Enumeration < ActiveRecord::Base
     Enumeration.update_all("is_default = #{connection.quoted_false}", {:opt => opt}) if is_default?
   end
   
+  def <=>(enumeration)
+    position <=> enumeration.position
+  end
+  
   def to_s; name end
   
 private