Multiple polymorphic joins in Rails

address.rb

# app/models/address.rb

class Address < ActiveRecord::Base
  belongs_to :addressable, polymorphic: true
end

addressable.rb

# app/models/concerns/addressable.rb

module Addressable
  extend ActiveSupport::Concern

  module ClassMethods
    def has_address(named)
      has_one :"#{named}_address", -> { where :address_type => named }, :class_name => "Address", :as => :addressable

      define_method "#{named}_address=" do |record|
        record.address_type = named
        super(record)
      end
    end
  end
end

order.rb

# app/models/order.rb

class Order < ActiveRecord::Base
  include Addressable
  
  has_address :billing
  has_address :shipping
end