User prference system basically done

app/models/user_preference.rb

@@ -1,3 +1,13 @@
 class UserPreference < ActiveRecord::Base
   belongs_to :user
+
+  # Turn this Node in to an XML Node without the <osm> wrapper.
+  def to_xml_node
+    el1 = XML::Node.new 'preference'
+    el1['k'] = self.k
+    el1['v'] = self.v
+    
+    return el1
+  end
+
 end