money.rb

Usage with ActiveRecord

Use the compose_of helper to let active record deal with embedding the money object in your models. The following example requires a cents and a currency field.

  class ProductUnit < ActiveRecord::Base
    belongs_to :product
    composed_of :price, :class_name => "Money", :mapping => [ %w(cents cents), %w(currency currency) ]

    private
      validate :cents_not_zero

      def cents_not_zero
        errors.add("cents", "cannot be zero or less") unless cents > 0
      end

      validates_presence_of :sku, :currency
      validates_uniqueness_of :sku
  end