cron_delayed_job.rb

# from http://missingfeature.com/scheduling-crons-with-delayedjob?c=1
class DjCron
  def self.step(action, period, change = {})
    next_at = Time.now.change(change) + period

    puts "Performing #{action.to_s} and rescheduling at #{next_at.to_s}"

    self.reschedule_at(next_at, action, period, change)
  end
  
  def self.reschedule_at(send_at, action, period, change = {})
    method = Delayed::PerformableMethod.new(self, :step, [action,period, change])
    Delayed::Job.enqueue(method, 0, send_at)
  end
end