<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def enqueue_or_delay(self, queue_name=None, priority=None, delayed_until=None, prepend=False, queue_model=None):
 """ Will enqueue or delay the job depending of the delayed_until. """

        queue_name = self._get_queue_name(queue_name)

        fields = {'queued': '1'}

        if priority is not None:
            fields['priority'] = priority
        else:
            priority = self.priority.hget()

        in_the_future = delayed_until and delayed_until > datetime.utcnow()

        if in_the_future:
            fields['delayed_until'] = str(delayed_until)
            fields['status'] = STATUSES.DELAYED
        else:
            self.delayed_until.delete()
            fields['status'] = STATUSES.WAITING

        self.hmset(**fields)

        if queue_model is None:
            queue_model = self.queue_model
        queue = queue_model.get_queue(queue_name, priority)

        if in_the_future:
            queue.delay_job(self, delayed_until)
        else:
            queue.enqueue_job(self, prepend)