decorators & tree model

app/controllers/application_controller.rb

@@ -84,4 +84,10 @@ class ApplicationController < ActionController::Base
       nil
     end
   end
+
+  def no_cache_headers
+    response.headers["Cache-Control"] = "no-cache, no-store, max-age=0, must-revalidate"
+    response.headers["Pragma"] = "no-cache"
+    response.headers["Expires"] = "Fri, 01 Jan 1990 00:00:00 GMT"
+  end
 end