有许多选项的Django投票如何限制可见性？

from django.db import models
from django.contrib.auth.models import User

class Poll(models.Model):
    question = models.CharField(max_length=200)
    is_visible = models.BooleanField(default=False)

class PollOption(models.Model):
    poll = models.ForeignKey(Poll, on_delete=models.CASCADE)
    option_text = models.CharField(max_length=200)

from django.shortcuts import render, get_object_or_404
from django.contrib.auth.decorators import login_required
from .models import Poll

@login_required
def poll_detail(request, poll_id):
    poll = get_object_or_404(Poll, pk=poll_id)
    if not poll.is_visible:
        return render(request, 'polls/poll_not_visible.html')
    # 处理投票逻辑
    return render(request, 'polls/poll_detail.html', {'poll': poll})

<h1>{{ poll.question }}</h1>
<ul>
    {% for option in poll.polloption_set.all %}
        <li>{{ option.option_text }}</li>
    {% endfor %}
</ul>

<h1>This poll is not visible to you.</h1>