Rails 1.2 is now officially deprecated for Heroku apps. Starting January 3 (that’s tomorrow), new features we are developing will not be available on apps still configured to use Rails 1.2. Then, on January 21, we will automatically upgrade any remaining 1.2 apps.
We know it’s only been a month since Rails 2 came out, so we hope this doesn’t come across as overly harsh. By taking this approach we can spend less time backporting, which means more time for new features. Since Heroku is still in early beta we feel that this is reasonable. Rest assured that when the next major Rails release comes around, we’ll be committed to supporting 2.0 for a much longer time window.
In most cases, upgrading should be as easy as changing your `config/environment.rb` to contain 2.0.2 instead of 1.2.x, and adding a block that looks like this to your initializer:
config.action_controller.session = {
:session_key => '_my_app_session',
:secret => '241b740a2f480d9776e6ce0c36b51f9df46ecf1d25814cd03b4d14dbb6ba7cd92'
}