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Follow the below mentioned steps to migrate an application from rails 2.2 to rails 2.3.

1. Install/Upgrade your rails to rails 2.3.5 and also install/upgrade dependency gem packages.

2. make a copy of your old rails application

3. change name of rails_home/app/controller/application.rb to rails/home/app/controller/application_controller.rb

4. change the rails version value in rails_home/config/environment.rb from 2.2.2 to 2.3.5

e.g. RAILS_GEM_VERSION = '2.3.5' unless defined? RAILS_GEM_VERSION

5. Start the server,

   ruby script/server


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