e838c0b70d7b978c173c0cc5a7b1bbc3a1080be8
1 class Order
< ActiveRecord
::Base
2 belongs_to
:billing, :class_name => 'Customer', :foreign_key => 'billing_customer_id'
3 belongs_to
:shipping, :class_name => 'Customer', :foreign_key => 'shipping_customer_id'