Django如何仅在CBV列表视图中显示可用项目？

Question

我有两个模型， Car和Booking。ACar是模型中的ForeignKey字段Booking。如果Car已预订，它仍显示在Car列表中。

我在is_available_car模型字段中将模型字段Car设置为default=True。如果Car已预订，则在未预订之前不会显示。我有一个预订表格，如果Car已预订，用户将无法预订，并且不会显示在CarListView

请帮帮我。谢谢你。

models.py

class Booking(models.Model):

    booking_name = models.CharField(max_length=240, null=False)

    customer_name = models.ForeignKey(Customer, on_delete=models.CASCADE, related_name='book_customers' )

    book_car = models.ForeignKey(Car, on_delete=models.CASCADE, related_name='book_car')

    booking_start_date = models.DateTimeField(auto_now_add=True, blank=False)

    booking_end_date = models.DateTimeField(blank=True, null=True)

    rental_price = models.IntegerField(blank=False, null=False)

    times_pick = models.TimeField(blank=True)

    is_approved = models.BooleanField(default=False)

    def __str__(self):

        return self.booking_name

    def get_absolute_url(self):

        return reverse("buggy_app:detail",kwargs={'pk':self.pk})

views.py

class BookingView(FormView):

    template_name = 'buggy_app/booking.html'

    form_class = BookingForm

    model = Booking 

    success_url = reverse_lazy('index')

    def form_valid(self, form):

        form.save()

        return super(BookingView, self).form_valid(form)

    def get_context_data(self, **kwargs):

        # kwargs['car'] is the car booking now!

        try:

            kwargs['car'] = Car.objects.get(id=self.request.GET.get('car', ''))

        except (Car.DoesNotExist, ValueError):

            kwargs['car'] = None

            return super(BookingView, self).get_context_data(**kwargs)

    def get_initial(self):

        initial = super(BookingView, self).get_initial()

        if 'car' in self.request.GET:

            try:

                initial['book_car'] = Car.objects.get(id=self.request.GET['car'])

            except (Car.DoesNotExist, ValueError):

                pass

                return initial

class CarListView(ListView):

    context_object_name = 'cars'

    model = Car