illustration for Law of Demeter for my blog

address.rb

class Address < ActiveRecord::Base
  attr_accessible :country, :city, :street, :building
  belongs_to :user
end

order.rb

class Order < ActiveRecord::Base
  belongs_to :user
end

order_demeter.rb

class Order < ActiveRecord::Base
  belongs_to :user
  delegate :country,
           :city,
           :street,
           :building,
           :to => :user,
           :prefix => true
end

user.rb

class User < ActiveRecord::Base
  has_one :address
  has_many :orders
end

user_demeter.rb

class User < ActiveRecord::Base
  has_one :address
  has_many :orders

  delegate :country,
           :city,
           :street,
           :building,
           :to => :address
end