Little module for define dynamic methods that automatically convert values from methods ending in `_cents` methods to `BigDecimal` dollars.

dollarable.rb

module Dollarable
  def acts_as_dollarable
    attribute_names.select { |m| m.ends_with?('_cents') }.each do |m|
      define_method m.gsub(/_cents/, '') do
        value = send(m)
        return BigDecimal(0) if value.blank? || value.zero?
        BigDecimal(value) / 100
      end
    end
  end
end