Django 表单向导 - 根据第一个表单步骤进行选择

Question

我使用 FormWizard 创建了一个两步表单，如下所示:

• 第一步:询问用户位置
• 第二步:显示多个搜索结果取决于用户位置，并将其显示为单选按钮

现在第二个表单取决于第一个表单的输入。几个博客或 stackoverflow 帖子涵盖了类似的主题，我按照说明进行操作。但是，应该在 process_step 期间保存的变量对于下一个 _init_ 不可用。

如何将变量位置从 process_step 传送到_init_？

class reMapStart(forms.Form):
    location = forms.CharField()
    CHOICES = [(x, x) for x in ("cars", "bikes")]
    technology = forms.ChoiceField(choices=CHOICES)

class reMapLocationConfirmation(forms.Form):

   def __init__(self, user, *args, **kwargs):
       super(reMapLocationConfirmation, self).__init__(*args, **kwargs)
       self.fields['locations'] = forms.ChoiceField(widget=RadioSelect(), choices=[(x, x)  for x in location])

class reMapData(forms.Form):
   capacity = forms.IntegerField()

class reMapWizard(FormWizard):
   def process_step(self, request, form, step):
       if step == 1:
          self.extra_context['location'] = form.cleaned_data['location']

   def done(self, request, form_list):
       # Send an email or save to the database, or whatever you want with
       # form parameters in form_list
       return HttpResponseRedirect('/contact/thanks/')

非常感谢任何帮助。

谢谢，

PS:帖子已使用更新的代码进行更新。

Answer 1

我认为您可以直接在 __init__ 方法中访问 POST 字典，因为看起来向导将 POST 传递到每个表单实例中通过 get_form，但由于某种原因我看不到数据。

我没有花太多时间思考这个问题，而是使用 render_template 钩子(Hook)。

class ContactWizard(FormWizard):
    def done(selef, request, form_list):
        return http.HttpResponse([form.cleaned_data for form in form_list])

    def render_template(self, request, form, previous_fields, step, context=None):
        """
        The class itself is using hidden fields to pass its state, so
        manually grab the location from the hidden fields (step-fieldname)
        """
        if step == 2: 
            locations = Location.objects.filter(location=request.POST.get('1-location'))
            form.fields['locations'].choices = [(x, x) for x in locations]
        return super(ContactWizard, self).render_template(request, form, previous_fields, step, context)