currency.rb

module DataMapper
  module Types
    class Currency < DataMapper::Type
      class BigDecimal255 < ::BigDecimal
        limit 255
      end

      primitive String
      size 255

      def self.load(value, property)
        return nil if value.nil?
        BigDecimal255.new(value.to_s)
      end

      def self.dump(value, property)
        return nil if value.nil?
        value.to_s
      end

      def self.typecast(value, property)
        if value.kind_of?(BigDecimal255)
          value
        elsif value.nil?
          load(nil, property)
        else
          load(value.to_s, property)
        end
      end
    end
  end
end