order_decorator.rb

module Spree
  class OrderObserver < ActiveRecord::Observer
    # Generic transition callback *after* the transition is performed
    def after_transition(order, transition)
      raise "after transtion"
    end
  
    def after_complete(order, transition)
      raise "It works!!!"
    end
  
    def after_address(order, transition)
      raise "works!!!"
    end
  end
end