Django FormWizard - 如何根据上一步动态创建表单集

Question

我见过 这篇文章 并不起作用（部分原因是它已过时）。我还研究了源代码树，但无济于事（测试有帮助），但我找不到答案。我想要做的是在 form0 （'start'）中获取一组数据种子，它将动态地为步骤 2 构建一个表单集。步骤 2 只是一个验证步骤。

1. 'start' - 用户输入分区 (subA)、邮政编码 (12345) 和批次 csv (51,52,53)
2. 'step2' - 创建动态表单 (modelformset)，其中包含代表 51,52,53
3. 用户点击 的 3 个表单go 并构建模型

，即

data = [ { 'subdivision': <subA>, 'zipcode': '12345', 'lot_number': '51'}
         { 'subdivision': <subA>, 'zipcode': '12345', 'lot_number': '52'}
         { 'subdivision': <subA>, 'zipcode': '12345', 'lot_number': '53'} ]

我尝试过的内容

实施解决方案时这里我只获取data=None。这是过时的，查看源代码，我认为“正确”的方法是简单地重写 get_form_instance 方法并提供它get_cleaned_data_for_step，但这似乎重新验证和做了比我认为需要做的更多的事情（但它不起作用）。

所以..我正在寻找两件事。

1. 获取以前的表单数据的正确方法是什么？
2. 我如何获取该数据并使用它来创建 n 个表单集。

FWIW 我正在使用 Django 1.4-alpha 表单集向导。

这是我所拥有的。

# urls.py
    url(r'homes/bulk/$', TestWizard.as_view([('start', BulkHomeForm0),
                                             ('step2', HomeFormSet)])),

# Models.py
class Subdivision(models.Model):
    name = models.CharField(max_length=64)

class Home(models.Model):
    lot_number = models.CharField(max_length=16)
    subdivision = models.ForeignKey(Subdivision)
    zipcode = models.IntegerField(validators=[validate_zipcode], null=True)

# Forms
class BulkHomeForm0(forms.Form):
    subdivision = forms.ModelChoiceField(queryset=Subdivision.objects.all(), required=True)
    zipcode = USZipCodeField(required=True)
    lots = forms.CharField(max_length=5000, widget=forms.Textarea()

    def clean(self):
        subdivision = self.cleaned_data.get('subdivision', False)
        zipcode = self.cleaned_data.get('zipcode', False)
        final_data = []
        for item in self.cleaned_data.get('lots', "").split(",")
            final_data.append({'subdivision':subdivision, 
                               'zipcode':zipcode, 
                               'lot_number':item})
        self.cleaned_data['homes'] = final_data

class BulkHomeForm1(forms.ModelForm):
    class Meta:
        model = Home

HomeFormSet = modelformset_factory(Home, form=BulkHomeForm1, extra=2)

# Views.py
class TestWizard(WizardView):
    storage_name = 'django.contrib.formtools.wizard.storage.session.SessionStorage'

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

    def done(self, form_list, **kwargs):
        return render_to_response('done.html', {
            'form_data': [form.cleaned_data for form in form_list],
        })

Answer 1

这是我想到的......

我似乎无法让 modelForm 很好地工作，所以我将两者分开并在完成时将它们合并。它还不完美，但已经很接近了..

class BulkHomeForm1(forms.Form):

    lot_number = forms.CharField(max_length=16, required=True)
    street_line1 = forms.CharField(max_length=100, required=True)
    floorplan = forms.ModelChoiceField(queryset=Floorplan.objects.filter(is_active=True), required=False)
    start_date = forms.DateField(required=False)

temp_storage_location = tempfile.mkdtemp(dir=settings.MEDIA_ROOT, prefix="bulk_homes_")
os.chmod(temp_storage_location,  02775) # TODO FIX ME
temp_storage = FileSystemStorage(location=temp_storage_location)

class BulkHomeWizard(SessionWizardView):
    file_storage = temp_storage

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

        form = super(BulkHomeWizard, self).get_form(step=step, data=data, files=files)
        if self.steps.current == 'start' and form.prefix != "step2":
            # Limit the subdivisions down to the specifics
            sub_qs = Subdivision.objects.filter(is_active=True)
            if self.request.user.company_type == "rater":
                sub_qs = sub_qs.filter(rater_orgs=self.request.user.company.id)
            elif self.request.user.company_type == "eep":
                sub_qs = sub_qs.filter(eep_orgs=self.request.user.company.id)
            form.fields['subdivision'].queryset = sub_qs
        return form

    def get_context_data(self, form, **kwargs):
        context = super(BulkHomeWizard, self).get_context_data(form, **kwargs)
        self.template_name = 'axis/bulk_%s.html' %  self.steps.current
        return context

    def get_form_initial(self, step):
        """This is used to seed the model set with information from the previous step"""
        if step == 'step2':
            log.info("Into Step 2")
            data = self.get_cleaned_data_for_step('start')['homes']
            return data
        return self.initial_dict.get(step, {})

    def done(self, form_list, **kwargs):

        cleaned_data = [form.cleaned_data for form in form_list]

        subdivision = cleaned_data[0].get('subdivision')
        city = subdivision.city
        state = subdivision.state
        zipcode = cleaned_data[0].get('zipcode')

        for form in cleaned_data[1]:
            data = Home.objects.get_or_create(lot_number = form.get('lot_number'),
                                              floorplan = form.get('floorplan', None),
                                              street_line1 = form.get('street_line1', None),
                                              subdivision = subdivision,
                                              city = subdivision.city, state=subdivision.state,
                                              zipcode=zipcode,
                                              start_date = form.get('start_date', None),)
            obj, created = data
            obj.clean()
            obj.save()
            if created:
                log.info("Create new Home")

        return HttpResponseRedirect(reverse("subdivision_view", kwargs={'subdivision_id': subdivision.id}))