session_migration generator adds an index on updated_at. Closes #6207.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5105 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

railties/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* session_migration generator adds an index on updated_at.  #6207 [grg]
+
 * script/server creates the tmp/pids directory.  #6204 [jonathan]
 
 * Fix script/console --sandbox for internal transactions changes.  #5738 [chris@octopod.info, charles.gerungan@gmail.com]

railties/lib/rails_generator/generators/components/session_migration/templates/migration.rb

@@ -5,8 +5,9 @@ class <%= class_name %> < ActiveRecord::Migration
       t.column :data, :text
       t.column :updated_at, :datetime
     end
-    
+
     add_index :<%= session_table_name %>, :session_id
+    add_index :<%= session_table_name %>, :updated_at
   end
 
   def self.down