Mixin to handle storing currency as integers.

gistfile1.rb

module Centsify
  extend ActiveSupport::Concern

  module ClassMethods
    def centsify(*columns)
      columns = [columns] unless columns.is_a?(Array)
      columns.each do |column|
        define_method column do
          self.send("#{column}_cents").to_i / 100.0
        end

        define_method "#{column}=" do |amount|
          self.send("#{column}_cents=",(BigDecimal(amount.is_a?(String) ? amount : amount.to_s) * 100).to_i)
        end
      end
    end
  end
end