gistfile1.rb

module EnablerDisabler  
  def enable(method)
    self.class.send(:class_variable_get, '@@enabler_status')[method.to_s] = true
  end
  
  def disable(method)
    self.class.send(:class_variable_get, '@@enabler_status')[method.to_s] = false
  end
  
  def self.included(base)
    base.class_eval do
      @@enabler_status = {}
      def self.enabled?(method)
        @@enabler_status[method.to_s]
      end
      
      # only add enabler/disabler for instance methods we have defined on the model (excludes the ar methods or those added by plugins)
      instance_methods.reject{|m| (ActiveRecord::Base.instance_methods + ['enable', 'disable']).include?(m)}.each do |m|
        @@enabler_status.update(m => true)
        define_method(m) do |*args|
          super if self.class.enabled?(m)
        end
      end
    end
  end
end

class DummyCheckout < Checkout
  include EnablerDisabler
  
  # by default, disable these methods since they are automatically called in Checkout#initialize
  [:check_user, :determine_state, :check_prior_purchase, :process_state, :extract_gift_options, :extract_payment_options].each do |m|
    @@enabler_status[m.to_s] = false
  end
end