gistfile1.rb

class SmsNotifier
  # We want to reuse code from this class,
  # and we try to do that by using inheritance.
  def notify!
    # texting magic happens here
  end
end


class ReportGenerator < SmsNotifier
  # Send text messages when the report is done - no problem
  def report_done_hook
    notify!
  end
end


class ReportArchiver < ActiveRecord::Base
  # Oops! this object already has a superclass!
  # How do you reuse the code now?
  def report_compressed_hook
    # notify!
  end
end