Django 表单向导：为什么提交后不调用 done() 方法？

Question

我正在使用 SessionWizardView，但我不明白为什么从未调用 done() 方法。相反，在发布我的表单后，在最后一步中，我可以在我的服务器上看到一个 POST HTTP 200，但这没有任何作用。 get_form() 方法按预期工作。

我怀疑是分心错误，因为我对另一个视图有完全相同的逻辑，而且效果很好。

下面是完整的代码。

景色

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'))

表格

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)])

模板

add_discount.html

{% extends "base_dashboard.html" %}
{% load verbose_name %}

{% block dashboard_title %}
    Créer une {% model_name model %} : étape {{ wizard.steps.step1 }} / {{ wizard.steps.count }}
{% endblock dashboard_title %}

{% block dashboard_content %}

    <form action='' method='post' novalidate>
        {% csrf_token %}
        {% include 'includes/_wizard_form_horizontal.html' with wizard=wizard %}
    </form>

{% endblock dashboard_content %}

_wizard_form_horizontal.html

{{ wizard.management_form }}
{% if wizard.form.forms %}
    {{ wizard.form.management_form }}
    {% for form in wizard.form.forms %}
        {% include 'includes/_form_horizontal.html' with form=form %}
    {% endfor %}
{% else %}
    {% include 'includes/_form_horizontal.html' with form=wizard.form %}
{% endif %}


{% if wizard.steps.prev %}
    <button class="btn btn-primary" name="wizard_goto_step" type="submit"
            value="{{ wizard.steps.prev }}">
        &laquo; étape précédente
    </button>
{% endif %}
<input type="submit" class="btn btn-primary" value="étape suivante &raquo;"/>

Answer 1

如果 form 在最后一步 is_valid() 中提交，则始终调用 done() 方法。因此，如果不是，那一定意味着您的 form 无效。

在您的情况下，您隐藏了 DiscountForm1 所需的字段。所以你也隐藏了这些字段的错误。如果填写了适当的字段，您应该将它们设为可选并检查表单的 clean() 方法。

Django 表单向导：为什么提交后不调用 done() 方法？

Django Form Wizard: why done() method is not called after submitting?

python

django

django-forms

django-formwizard

景色

表格

模板

add_discount.html

_wizard_form_horizontal.html