address saving almost works

front-api/models/cart.rb

@@ -1,10 +1,13 @@
 class Cart < ActiveRecord::Base
   has_many :item_in_carts, -> { order "created_at" }
+  belongs_to :delivery_destination
  
   def self.find_or_create(anonymous_id, user_id)
     cart = Cart.where(user_id: user_id).where(ordered: false).first
     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!
+    return cart
   end
 end

front-api/models/delivery_destination.rb

@@ -0,0 +1,4 @@
+class DeliveryDestination < ActiveRecord::Base  
+  has_one :cart
+  belongs_to :user
+end