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class Customer < ActiveRecord::Base
composed_of :address, :mapping => [ %w(address_street street), %w(address_city city), %w(address_country country) ]
composed_of :balance, :class_name => "Money", :mapping => %w(balance amount)
end
class Address
attr_reader :street, :city, :country
def initialize(street, city, country)
@street, @city, @country = street, city, country
end
def close_to?(other_address)
city == other_address.city && country == other_address.country
end
end
class Money
attr_reader :amount, :currency
EXCHANGE_RATES = { "USD_TO_DKK" => 6, "DKK_TO_USD" => 0.6 }
def initialize(amount, currency = "USD")
@amount, @currency = amount, currency
end
def exchange_to(other_currency)
Money.new((amount * EXCHANGE_RATES["#{currency}_TO_#{other_currency}"]).floor, other_currency)
end
end
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