money monkey patch

money.rb

module ActiveRecord
  class Base
    def self.money_attributes(*attrs)
      (attrs || []).each do |attr|
        attr = attr.to_s
        define_method attr do 
          read_attribute(attr).tap do |value|
            value = value.to_money if value
          end
        end

        define_method "#{attr}=" do |value|
          value_string = value.to_s.strip
          if value_string.blank? 
            super(nil)
          else
            if value_string.match(/\p{alpha}/)
              super(value_string)
            else
              super(value_string.to_money.to_f)
            end
          end
        end
      end
    end
  end
end