module DateObject
  # waits till it's imported AND THEN calls validate
  # needed because of the "strange" way Ruby parses through code
  def self.included(base) # base = class that this module is imported into
    base.validate :date_not_in_past
  end


  def date_in_past?
    Time.now > date
  end

  ################################
  def self.find_in_future
    date_objects = self.find(:all)
    date_objects.delete_if { |obj| obj.date_in_past? }
    date_objects
  end
  ################################

protected
  def date_not_in_past
    if date_in_past?
      errors.add(:date, ": You can't schedule Festivals in the past!")
    end
  end
end

class Party < ActiveRecord::Base
  include DateObject
end

class Dance < ActiveRecord::Base
  include DateObject
end