AppTweeter.rb

class AppTweeter < Struct.new(:status)
  class << self
    def new_user(user)
      update("#{user.name} just signed up!")
    end
    
    def update(status)
      status = "[#{Rails.env}] #{status}" unless Rails.env.production?
      Delayed::Job.enqueue AppTweeter.new(status)
    end
  end
  
  def perform
    raise "Twitter update failed" unless Kernel.system(
      "curl -u twitter_handle:password -d \"status=#{URI.escape(status)}\" http://twitter.com/statuses/update.xml"
    )
  end
end