django formtools 通过 GET 参数获取初始数据

Question

我正在使用 django-formtools 创建表单向导。我想使用 get-parameter 预先填写表单的第一部分。首先，我使用常规 django 表单验证 GET 数据。

form.py

class MiniConfiguratorForm(forms.Form):
    width = forms.IntegerField(min_value=MIN_WIDTH, max_value=MAX_WIDTH, initial=25, label=_('width'))
    height = forms.IntegerField(min_value=MIN_HEIGHT, max_value=MAX_HEIGHT, initial=25, label=_('height'))
    amount = forms.IntegerField(min_value=MIN_QUANTITY, max_value=MAX_QUANTITY, initial=1, label=_('amount'))

class ConfiguratorStep1(forms.Form):
    # ...
    width = forms.IntegerField(widget=forms.NumberInput(), min_value=MIN_WIDTH, max_value=MAX_WIDTH, initial=25, label=_('width'))
    height = forms.IntegerField(widget=forms.NumberInput(), min_value=MIN_HEIGHT, max_value=MAX_HEIGHT, initial=25, label=_('height'))
    amount = forms.IntegerField(widget=forms.NumberInput(), min_value=MIN_QUANTITY, max_value=MAX_QUANTITY, initial=1, label=_('amount'))

class ConfiguratorStep2(forms.Form):
    name = forms.CharField(max_length=100, required=True)
    phone = forms.CharField(max_length=100)
    email = forms.EmailField(required=True)

views.py

class ConfiguratorWizardView(SessionWizardView):
    template_name = "www/configurator/configurator.html"
    form_list = [ConfiguratorStep1, ConfiguratorStep2]

    def done(self, form_list, **kwargs):
        return render(self.request, 'www/configurator/done.html', {
            'form_data': [form.cleaned_data for form in form_list]
        })

    def get(self, request, *args, **kwargs):
        """
        This method handles GET requests.

        If a GET request reaches this point, the wizard assumes that the user
        just starts at the first step or wants to restart the process.
        The data of the wizard will be reset before rendering the first step
        """
        self.storage.reset()
        # reset the current step to the first step.
        self.storage.current_step = self.steps.first

        mini_configurator = MiniConfiguratorForm(data=request.GET)
        init_data = None
        if mini_configurator.is_valid():
            init_data = {
                    'width': '35',
                    'height': '33',
                    'amount': '17',
            }
            print("valid")
        else:
            print("invalid haxx0r")
        return self.render(self.get_form(data=init_data))

我的方法是覆盖 get() 并在 self.get_form(data) 中传递数据。这不能正常工作。所有字段均为空。如果我在没有参数的情况下访问表单，则表单会正确呈现。

Answer 1

来自文档：

向导的表单对象的初始数据可以使用 可选的 initial_dict 关键字参数。这个论点应该是 将步骤映射到包含初始的字典的字典 每一步的数据。初始数据字典将被传递 以及步骤的 Form 的构造函数：

>>> from myapp.forms import ContactForm1, ContactForm2
>>> from myapp.views import ContactWizard
>>> initial = {
...     '0': {'subject': 'Hello', 'sender': 'user@example.com'},
...     '1': {'message': 'Hi there!'}
... }
>>> # This example is illustrative only and isn't meant to be run in
>>> # the shell since it requires an HttpRequest to pass to the view.
>>> wiz = ContactWizard.as_view([ContactForm1, ContactForm2], initial_dict=initial)(request)
>>> form1 = wiz.get_form('0')
>>> form2 = wiz.get_form('1')
>>> form1.initial
{'sender': 'user@example.com', 'subject': 'Hello'}
>>> form2.initial
{'message': 'Hi there!'}

更多信息：https://django-formtools.readthedocs.io/en/latest/wizard.html#providing-initial-data-for-the-forms