class Rufus::Scheduler::OneTimeJob

def determine_id
  [
    self.class.name.split(':').last.downcase[0..-4],
    @scheduled_at.to_f,
    @next_time.to_f,
    (self.object_id < 0 ? 'm' : '') + self.object_id.to_s
  ].map(&:to_s).join('_')
end