module OrbitModel

  module TimeFrame

    def self.included(base)
      base.class_eval do
        field :postdate , :type => DateTime
        field :deadline , :type => DateTime
        before_save :check_deadline
        send :include, InstanceMethods
      end
    end

    module InstanceMethods

      def is_expired?
        Date.today > self.deadline ? true : false  rescue false
        #some dates might sat as nil so rescue false
      end
      
      private

      def check_deadline
        if(!self.deadline.nil? and (self.deadline < self.postdate ))
          self.deadline = nil
        end
      end
      
    end

  end

end