Rails GEM+Railtie+ApplicationController not loading

This tutorial http://thoughtsincomputation.com/posts/coding-an-acts_as-gem-for-rails-3 does not work for Rails 3.0.5. The ApplicationController is not defined so when I call

ApplicationController.send(:extend, ActsAsAwesome开发者_如何学C::Hook)

nothing happens. Can anyone tell me why or how to fix it? Thx!

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I replaced it with ActionController::Base and it works now.