Django表单向导：为什么提交后未调用done（）方法？

Question

我正在使用B1，但我不明白为什么从未调用过status = 'A'方法。相反，在发布表单后，在最后一步中，我可以在服务器上看到SessionWizardView，但这无济于事。 done()方法按预期工作。

我怀疑这是一种分散注意力的错误，因为我对另一种视图具有完全相同的逻辑，而且效果很好。

下面是整个代码。

视图

POST HTTP 200

表格

get_form()

模板

add_discount.html

class DiscountsCreateView(PermissionRequiredCanHandleProducts,
                      ModelInContextMixin,
                      RestaurantMixin, SubSectionDiscounts,
                      SessionWizardView):
    """ Wizard view to create a discount in 2 steps """

    model = Discount  # used for model context
    form_list = [DiscountForm0, DiscountForm1]
    template_name = "discounts/discount_add.html"

    def get_form(self, step=None, data=None, files=None):
        form = super().get_form(step, data, files)

        if step is None:
            step = self.steps.current

        # step0 - name, kind, tax_rate
        # => nothing special to do, always the same form

        # step1 - specific fields related to the chosen kind
        if step == '1':
            step0_data = self.storage.get_step_data('0')
            kind = step0_data['0-kind']
            # combo => combo, combo_unit_price
            if kind == Discount.COMBO:
                form.fields['combo'].queryset = Combo.objects.restaurant(self.restaurant)
                # NOTE : this is not a scalable way to show/hide fields (exponential)
                form.fields['rebate_amount'].widget = forms.HiddenInput()
            elif kind == Discount.REBATE:
                form.fields['combo'].widget = forms.HiddenInput()
                form.fields['combo_unit_price'].widget = forms.HiddenInput()

        return form

    def done(self, form_list, **kwargs):
        data = [form.cleaned_data for form in form_list]
        try:
            Discount.objects.create(
                name=data[0]['name'],
                kind=data[0]['kind'],
                tax_rate=data[0]['tax_rate'],
                rebate_amount=data[1]['rebate_amount'],
                combo=data[1]['combo'],
                combo_unit_price=data[1]['combo_unit_price']
            )
        except Exception as e:
            messages.add_message(self.request, messages.ERROR, MSG_DISCOUNT_ADD_KO.format(e))
        else:
            messages.add_message(self.request, messages.SUCCESS, MSG_DISCOUNT_ADD_OK)

        return redirect(reverse('bo:discount-list'))

_wizard_form_horizo​​ntal.html

class DiscountForm0(forms.Form):
    name = forms.CharField(
        label=verbose_display(Discount, 'name'))
    kind = forms.ChoiceField(
        label=verbose_display(Discount, 'kind'),
        choices=Discount.KIND_CHOICES)
    tax_rate = forms.ModelChoiceField(
        label=verbose_display(Discount, 'tax_rate'),
        queryset=TaxRate.objects.all())


class DiscountForm1(forms.Form):
    """
    Contains all the specific fields for all discount kinds.
    The goal is to only show the fields related to the right discount kind
    """

    # For REBATE kind only
    rebate_amount = forms.DecimalField(
        label=verbose_display(Discount, 'rebate_amount'),
        validators=[MaxValueValidator(0)])

    # For COMBO kind only
    combo = forms.ModelChoiceField(
        label=verbose_display(Discount, 'combo'),
        queryset=Combo.objects.none()) 
    combo_unit_price = forms.DecimalField(
        label=verbose_display(Discount, 'combo_unit_price'),
        validators=[MinValueValidator(0)])

Answer 1

如果在上一步done()中提交了form，则总是调用is_valid()方法。因此，如果不是，那必须表示您的form无效。

在您的情况下，您要隐藏DiscountForm1所需的字段。因此，您还隐藏了这些字段的错误。您应该将它们设为可选，并检查表单的clean()方法是否填写了适当的字段。