Rename contacts.copy_from_id to original_id

Add association

#660

app/models/concerns/domain/transferable.rb

@@ -57,7 +57,7 @@ module Concerns::Domain::Transferable
     oc = c.deep_clone
     oc.code = nil
     oc.registrar_id = registrar_id
-    oc.copy_from_id = c.id
+    oc.original = c
     oc.generate_code
     oc.remove_address unless Contact.address_processing?
     oc.save!(validate: false)

app/models/contact.rb

@@ -3,6 +3,7 @@ class Contact < ActiveRecord::Base
   include EppErrors
   include UserEvents
 
+  belongs_to :original, class_name: self.name
   belongs_to :registrar, required: true
   has_many :domain_contacts
   has_many :domains, through: :domain_contacts