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Rails 3.0.0 now has a release candidate. These are the changes I made to a new application I am working on to clear up any deprecation warnings.

Gemfile

gem ‘rails’, ’3.0.0.rc’
gem ‘haml’, ’3.0.14′

Obviously you have to tell your application to use the 3.0.0.rc. Also, it seems as if haml 3.0.13, which we were previously using, had some incompatible changes with Rails 3.0.0.rc

Rakefile

Change:

Rails::Application.load_tasks

to:

YourApplicationName::Application.load_tasks

config/environments/test.rb

Add:

config.active_support.deprecation = :stderr

config/routes.rb

Change:

YourApplicationName::Application.routes.draw do |map|

to:

YourApplicationName::Application.routes.draw do

Rails 3 routing in great detail: The Lowdown on Routes in Rails 3.