模板：{% for level in levels %}    {% if level.todo_set.all in tasks %}    <li>        <a href="javascript:;"><img src="{{ level.badge.url }}" alt="" /></a>    </li>    {% else %}    <li>        <a href="javascript:;"><img src="{{ level.locked_badge.url }}" alt="" /></a>    </li>    {% endif %}{% endfor %}視圖.py：@login_required(login_url="/account/login/")def StudentPublicProfile(request, pk=None):    student = User.objects.get(pk=pk)    levels = Level.objects.all()    todos = ToDo.objects.all()    list = []    tasks = Task.objects.filter(student=student)    for task in tasks:        list.append(task.todo)    context = {"student": student, "levels": levels, "tasks": list, "todos": todos}    return render(request, "student_public_profile2.html", context)模型.py：class Level(models.Model):    number = models.IntegerField()    badge = models.ImageField()    locked_badge = models.ImageField()    timestamp = models.DateTimeField(        auto_now_add=True, auto_now=False, blank=True, null=True    )    unlock = models.CharField(max_length=10, default="A")    def __str__(self):        return str(self.number)    def get_absolute_url(self):        return reverse("student:level-detail", kwargs={"pk": self.pk})class ToDo(models.Model):    level = models.ForeignKey(Level, on_delete=models.CASCADE)    name = models.CharField(max_length=150)    description = models.TextField()    timestamp = models.DateTimeField(        auto_now_add=True, auto_now=False, blank=True, null=True    )    def __str__(self):        return self.name基本上，每個級別都包含多個待辦事項。我想檢查該級別的所有待辦事項是否都包含在任務列表中。這就是我在模板中所做的。但我沒有得到正確的結果。這里可能是什么問題？在這里，我正在檢查某個級別的所有待辦事項是否都由特定用戶完成。只有當待辦事項完成時，它才會保存在任務中