confirming works, last address is now persisted, thank you page is up but not yet accessible

front-api/models/cart.rb

@@ -7,7 +7,7 @@ class Cart < ActiveRecord::Base
     cart ||= Cart.where(anonymous_id_string: anonymous_id).where(ordered: false).first
     safe_user_id = (user_id > 0) ? user_id : nil
     cart ||= Cart.create!(anonymous_id_string: anonymous_id, user_id: safe_user_id, ordered: false )
-    cart.delivery_destination ||= DeliveryDestination.create!
+    cart.delivery_destination ||= DeliveryDestination.find_or_create(anonymous_id, user_id);
     return cart
   end
-end
+end 

front-api/models/delivery_destination.rb

@@ -1,4 +1,11 @@
 class DeliveryDestination < ActiveRecord::Base  
   has_one :cart
   belongs_to :user
+
+  def self.find_or_create(anonymous_id, user_id)
+    dd = DeliveryDestination.where(user_id: user_id).order("id desc").first
+    dd ||= DeliveryDestination.where(anonymous_id_string: anonymous_id).order("id desc").first
+    dd ||= DeliveryDestination.create!({user_id: user_id, anonymous_id_string: anonymous_id })
+    return dd
+  end
 end