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diedthreetimes on #225 Upgrading to Rails 3 Part 1 2011-05-13 14:31:02

Its worth mentioning that you need to remove 'config/initializers/new_rails_defaults.rb' If you have one (as mentioned in the file's comments).

Otherwise you get an error like
undefined method 'generate_best_match=' for ActionDispatch::Routing:Module (NoMethodError)

Great Post!