Django Inlineformsets-使用django-extra-views进行自定义验证

Question

所以我有一个关于django-extra-views的form_valid的问题。 我使用CreateWithInlinesView方法创建具有多个内联表单集的表单。

名为“订单”的基本表单包含两个不同的表单集，“预订”和“付款”。 订单必须至少包含一个预订，但创建订单时不一定需要付款。

尽管如此，仍将生成付款表格。 我想在“ payment_amount”> 0上验证“付款”表单。如果在创建订单时没有付款，则不应保存任何PaymentInline。

views.py

class BookingInline(InlineFormSetFactory):
    model = Booking
    form_class = BookingForm
    prefix = 'booking_formset'
    factory_kwargs = {
        'extra': 0,
        'min_num': 1,
        'validate_min': True,
        'can_delete': True
    }

class PaymentInline(InlineFormSetFactory):
    model = Payment
    form_class = PaymentForm
    prefix = 'payment_formset'
    factory_kwargs = {
        'extra': 1,
        'min_num': 0,
        'validate_min': False,
        'can_delete': True
    }

class OrderCreateView(NamedFormsetsMixin, CreateWithInlinesView):
    model = Order
    inlines = [BookingInline, PaymentInline]
    inlines_names = ['booking_formset', 'payment_formset']
    form_class = OrderForm
    template_name = 'orders/order_form.html'

    def get_success_url(self):
        return reverse_lazy('order_detail', kwargs={'pk': self.object.pk})

    def forms_valid(self, form, inlines):
        """
        If the form and formsets are valid, save the associated models.
        """
        self.object = form.save(commit=False)
        self.object.created_by = self.request.user
        form.save(commit=True)
        for formset in inlines:
            formset.save()
        return HttpResponseRedirect(self.get_success_url())

因此逻辑将需要如下所示，尽管我收到一个错误消息，说“订单”对象没有属性“付款”，因为它是反向关系...

views.py

def forms_valid(self, form, inlines):
    """
    If the form and formsets are valid, save the associated models.
    """
    self.object = form.save(commit=False)
    self.object.created_by = self.request.user
    form.save(commit=True)
    for booking_formset in inlines:
        booking_formset.save()
    for payment_formset in inlines:
        if self.object.payment.amount > 0:
            payment_formset.save()
        else:
            pass
    return HttpResponseRedirect(self.get_success_url())

有谁知道如何处理表单中的不同表单集？

提前致谢！

Answer 1

我不确定您的表单集上哪些字段可用，但是您可以使用commit=False保存，然后遍历未提交的付款实例以获取总付款金额。

def forms_valid(self, form, inlines):
    booking_formset = inlines[0]
    payment_formset = inlines[1]

    self.object = form.save(commit=False)
    self.object.created_by = self.request.user
    form.save(commit=True)
    booking_formset.save()

    payments = payment_formset.save(commit=False)
    total_payment = sum(payment.amount for payment in payments)
    if total_payment > 0:
        payment_formset.save()

    return HttpResponseRedirect(self.get_success_url())

更新：

booking_formset in inlines: payment_formset in inlines:将引起问题。 假设内inlines是一个列表，您将遍历该列表两次。 相当于执行以下操作：

lst = [1, 2]
for x in lst:
    print(x)

for y in lst:
    print(y)

>>> 1
>>> 2
>>> 1
>>> 2