Rails 3: reload custom files at each request (or in console using reload!)

decorator_reloader.rb

if Rails.env.development?
  decorator_paths = Dir['app/**/*_decorator.rb']

  decorators_reloader = ActiveSupport::FileUpdateChecker.new(decorator_paths) do
    decorator_paths.each { |path| load path }
  end

  ActionDispatch::Callbacks.to_prepare do
    decorators_reloader.execute_if_updated
  end
end