gistfile1.rb

# Embedded Value for DataMapper (http://martinfowler.com/eaaCatalog/embeddedValue.html)

class Address
  include DataMapper::EmbeddedValue

  property :street,   String
  property :location, String
  property :region,   String
  property :country,  String
end

class Person
  include DataMapper::Resource

  property :id,      Serial
  property :name,    String
  property :address, Address  # Embedded Value
end

address = Address.new(
  :street   => '123 Main Street',
  :location => 'Anytown',
  :region   => 'BC',
  :country  => 'Canada'
)

person = Person.new(
  :name    => 'John Doe',
  :address => address
)

person.address_street    # => "123 Main Street"
person.address_location  # => "Anytown"