gistfile1.rb

require 'dm-core'
require 'money'

module DataMapper
    class Property
        class Money < Object
#            load_as ::Money
#             dump_as ::String
#          coercion_method :to_money

            def dump(v)
                v.to_s
            end

            def load(v)
                self.typecast_to_primitive(v)
            end

            def typecast_to_primitive(v)
                v.to_money
            end
        end
    end
end