class Product < ActiveRecord::Base attr_accessible :price_cents, :discount, :bonus_cents # Use USD as model level currency register_currency :usd # Use money-rails macros monetize :price_cents # Use a custom name for the Money attribute monetize :discount, :as => "discount_value" # Override default currency (EUR) with a specific one (GBP) for this field only monetize :bonus_cents, :with_currency => :gbp end