quotation.rb

class Quotation 

  # ...snip...

  # methods to be forwarded to the status policy class
  def self.status_policy_methods
    [:unconfirmed?, :expirable?, :approvable?, :rejectable?, :poolable?, :on_holdable?, :payable?, :callbackable?, :sendable?]
  end

  # methods to be forwarded to workflow class
  def self.workflow_methods
    QuotationWorkflow.instance_methods(false) - [:method_missing] + [:has_events?, :has_only_events?]
  end

  # the class to be used for the status policy
  def status_policy(policy_class = QuotationStatusPolicy)
    policy_class.new(self)
  end

  def workflow(workflow_class = QuotationWorkflow)
    workflow_class.new(self)
  end

  extend Forwardable 
  def_delegators :status_policy, *(Quotation.status_policy_methods)
  def_delegators :workflow, *(Quotation.workflow_methods)

  # ...snip ...
end