将模型属性值发送到其他模型并以其形式显示

Question

我正在开发一个应用程序，用户将在其中填写模型的第一个表单，他将被重定向到下一个表单，我想从第一个模型的属性中获取值传递给第二个模型并以其形式显示。

***Models***
class Delivery(models.Model):
    user = models.ForeignKey(
        Client, on_delete=models.CASCADE, verbose_name=_("Client"), related_name=_("delivery_user")
    )
    pickup_address = models.ForeignKey(Address, on_delete=models.CASCADE, related_name=_("pickup_address"))
    destination_address = models.ForeignKey(Address, on_delete=models.CASCADE, related_name=_("destination_address"))
    operation_date = models.DateField(
        _("desired pickup date"), auto_now=False, auto_now_add=False, blank=False, null=False
    )
    invoice = models.BooleanField(_("check if you want an invoice"), default=False)
    created_at = models.DateTimeField(_("Created at"), auto_now_add=True, editable=False)
    updated_at = models.DateTimeField(_("Updated at"), auto_now=True)
    delivery_key = models.CharField(max_length=200)

    @property
    def distance(self):
        distance = Distance(
            m=self.pickup_address.address_point.transform(32148, clone=True).distance(
                self.destination_address.address_point.transform(32148, clone=True)
            )
        )
        
        context = {}
        context["distance"] = f"{round(distance.m / 1000, 2)}"
        print(context)

        return context

    def __str__(self):
        return str(self.delivery_key)


class DeliveryDetails(models.Model):
    delivery = models.ForeignKey(Delivery, on_delete=models.CASCADE, related_name=_("delivery"))
    distance = models.DecimalField(_("Distance Approximative "), max_digits=7, decimal_places=2)
    delivery_price = models.DecimalField(max_digits=7, decimal_places=2)
    created_at = models.DateTimeField(_("Created at"), auto_now_add=True, editable=False)
    updated_at = models.DateTimeField(_("Updated at"), auto_now=True)

    def __str__(self):
        return str(self.created_at)
***Views***
class DeliveryCreateView(LoginRequiredMixin, UserPassesTestMixin, CreateView, FormView):
    model = Delivery
    form_class = UserDeliveryForm
    template_name = "deliveries/customer/edit_deliveries.html"

    def get_success_url(self):
        return reverse(
            "delivery:delivery-details",
            kwargs={"pk": self.object.pk, "distance": self.object.distance},
        )

    def test_func(self):
        return self.request.user.is_active  
  
  
class DetailsDeliveryCreateView(LoginRequiredMixin, UserPassesTestMixin, CreateView, FormView):
    model = DeliveryDetails
    form_class = DeliveryDetailsForm
    template_name = "deliveries/responsable/edit_deliveries_details.html"
    success_url = reverse_lazy("account:dashboard")

    def test_func(self):
        return self.request.user.is_active

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        delivery = Delivery.objects.filter(id=self.kwargs["pk"])
        context["form"].fields["delivery"].queryset = delivery
        distance = Delivery.objects.get(id=self.kwargs["pk"]).distance["google_distance"]
        return context

有没有办法在 DetailleDelivery 中获取 Delivery 实例（发票键和距离）并在用户填写 DeliveryDetailsForm 时将它们显示给用户？如果可能的话，我想避免多次访问数据库以获得相同的数据。

Answer 1

在您的 DetailsDeliveryCreateView 中设置表单初始值：

def get_initial(self):
    initial = super(DetailsDeliveryCreateView, self).get_initial()
    initial = initial.copy()
    delivery = Delivery.objects.get(id=self.kwargs["pk"])
    distance = delivery.distance["google_distance"]
    initial['distance'] = delivery
    initial['distance'] = distance
    return initial

Answer 2

您可以将传递传递到上下文中，如下所示：

上下文 ['delivery'] = 交付

然后在您的模板中，您可以使用 {{delivery.distance}} 以及您需要的任何其他内容。您将拥有整个对象。

显然这仅适用于相关父对象尚不存在的创建视图。在详细视图中，您可以通过子项访问父项。

此外，您可能希望使用 get_object_or_404 而不是过滤器来获取您的 Delivery 实例，以防有人尝试不存在的 pk。

此外，如果有意义的话，不要在表格中插入您的交付，只需将其完全关闭并覆盖您的 form_valid() 以在保存之前插入交付关系。

将模型属性值发送到其他模型并以其形式显示

Send model property value to other model and display it in it's form

django

django-models

django-forms

django-views

将模型 属性 值发送到其他模型并以其形式显示

Send model property value to other model and display it in it's form

django

django-models

django-forms

django-views

将模型属性值发送到其他模型并以其形式显示