gistfile1.txt

class Widget < ActiveRecord::Base

  AMERICAN_COLORS = %w(red white blue)

  # /(red|white|blue)/i
  validate :must_be_american
  
  def must_be_american
    unless AMERICAN_COLORS.include?(self.color.downcase)
      errors.add(:color, " has to be american (#{AMERICAN_COLORS.to_sentence}, buddy....")
    end
  
  end

end