Merge branch 'master' of https://github.com/kotfu/docrails into kotfu…

…-master

railties/guides/source/security.textile

@@ -166,7 +166,7 @@ end
 The section about session fixation introduced the problem of maintained sessions. An attacker maintaining a session every five minutes can keep the session alive forever, although you are expiring sessions. A simple solution for this would be to add a created_at column to the sessions table. Now you can delete sessions that were created a long time ago. Use this line in the sweep method above:
 
 <ruby>
-delete_all "updated_at < '#{time.to_s(:db)}' OR
+delete_all "updated_at < '#{time.ago.to_s(:db)}' OR
   created_at < '#{2.days.ago.to_s(:db)}'"
 </ruby>