Notifications should be sorted by updated_at

app/controllers/notifications_controller.rb

@@ -19,7 +19,7 @@ class NotificationsController < ApplicationController
 
   def index
     @notifications = Notification.find(:all, :conditions => {:recipient_id => current_user.id},
-                                       :order => 'created_at desc', :include => [:target, {:actors => :profile}]).paginate :page => params[:page], :per_page => 25
+                                       :order => 'updated_at desc', :include => [:target, {:actors => :profile}]).paginate :page => params[:page], :per_page => 25
     @group_days = @notifications.group_by{|note| I18n.l(note.updated_at, :format => I18n.t('date.formats.fullmonth_day')) }
     respond_with @notifications
   end