gistfile1.txt

From e80252e48de52485e5d1a68f0cea2e7420326abe Mon Sep 17 00:00:00 2001
From: Matthijs Langenberg <mlangenberg@gmail.com>
Date: Mon, 24 Jan 2011 11:37:14 +0100
Subject: [PATCH] Prevent ActiveRecord SessionStore from saving non-dirty sessions.

---
 activerecord/lib/active_record/session_store.rb |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/activerecord/lib/active_record/session_store.rb b/activerecord/lib/active_record/session_store.rb
index 3400fd6..425dd2e 100644
--- a/activerecord/lib/active_record/session_store.rb
+++ b/activerecord/lib/active_record/session_store.rb
@@ -81,6 +81,7 @@ module ActiveRecord
       cattr_accessor :data_column_name
       self.data_column_name = 'data'
 
+      before_save :data_changed?
       before_save :marshal_data!
       before_save :raise_on_session_data_overflow!
 
@@ -139,6 +140,17 @@ module ActiveRecord
       end
 
       private
+        def original_data
+          if changes && changes[@@data_column_name] && changes[@@data_column_name][0]
+            return self.class.unmarshal(changes[@@data_column_name][0])
+          end
+          return {}
+        end
+
+        def data_changed?
+          return false if original_data == data
+        end
+        
         def marshal_data!
           return false unless loaded?
           write_attribute(@@data_column_name, self.class.marshal(data))
-- 
1.6.6.1