表单向导的初始数据在Django中无法正确加载

我有一个三页的表单列表来自一个模型。我可以第一次保存模型，但是当我要编辑模型时，只有第一个表单显示初始值，后续的表单不显示初始数据。但是当我从视图中打印initial_dict时，我可以正确地看到所有初始视图。我一直在关注这个博客的表单向导。

这是我的model.py:

class Item(models.Model):
    user=models.ForeignKey(User)
    price=models.DecimalField(max_digits=8,decimal_places=2)
    image=models.ImageField(upload_to="assets/", blank=True)
    description=models.TextField(blank=True)
    def __unicode__(self):
        return '%s-%s' %(self.user.username, self.price)

urls . py:

urlpatterns = patterns('',
url(r'^create/$', MyWizard.as_view([FirstForm, SecondForm, ThirdForm]), name='wizards'),
url(r'^edit/(?P<id>d+)/$', 'formwizard.views.edit_wizard', name='edit_wizard'),
)

forms.py:

class FirstForm(forms.Form):
    id = forms.IntegerField(widget=forms.HiddenInput, required=False)
    price = forms.DecimalField(max_digits=8, decimal_places=2)
    #add all the fields that you want to include in the form
class SecondForm(forms.Form):
    image = forms.ImageField(required=False)
class ThirdForm(forms.Form):
    description = forms.CharField(widget=forms.Textarea)

views.py:

class MyWizard(SessionWizardView):
    template_name = "wizard_form.html"
    file_storage = FileSystemStorage(location=os.path.join(settings.MEDIA_ROOT))
    #if you are uploading files you need to set FileSystemStorage
    def done(self, form_list, **kwargs):
        for form in form_list:
           print form.initial
        if not self.request.user.is_authenticated():
                raise Http404
        id = form_list[0].cleaned_data['id']
        try:
                item = Item.objects.get(pk=id)
                ######################   SAVING ITEM   #######################
                item.save()
                print item
                instance = item
        except:
                item = None
                instance = None
        if item and item.user != self.request.user:
                print "about to raise 404"
                raise Http404
        if not item:
                instance = Item()
                for form in form_list:
                    for field, value in form.cleaned_data.iteritems():
                        setattr(instance, field, value)
                instance.user = self.request.user
                instance.save()
            return render_to_response('wizard-done.html', {
                'form_data': [form.cleaned_data for form in form_list], })

    def edit_wizard(request, id):
        #get the object
        item = get_object_or_404(Item, pk=id)
        #make sure the item belongs to the user
        if item.user != request.user:
            raise HttpResponseForbidden()
        else:
            #get the initial data to include in the form
            initial = {'0': {'id': item.id,
                             'price': item.price,
                             #make sure you list every field from your form definition here to include it later in the initial_dict
            },
                       '1': {'image': item.image,
                       },
                       '2': {'description': item.description,
                       },
            }
            print initial
            form = MyWizard.as_view([FirstForm, SecondForm, ThirdForm], initial_dict=initial)
            return form(context=RequestContext(request), request=request)

模板:

<html>
<body>
<h2>Contact Us</h2>
  <p>Step {{ wizard.steps.step1 }} of {{ wizard.steps.count }}</p>
  {% for field in form %}
    {{field.error}}
  {% endfor %}
  <form action={% url 'wizards' %} method="post" enctype="multipart/form-data">{% csrf_token %}
  <table>
  {{ wizard.management_form }}
  {% if wizard.form.forms %}
      {{ wizard.form.management_form }}
      {% for form in wizard.form.forms %}
          {{ form }}
      {% endfor %}
  {% else %}
      {{ wizard.form }}
  {% endif %}
  </table>
  {% if wizard.steps.prev %}
  <button name="wizard_goto_step" type="submit" value="{{ wizard.steps.first }}">"first step"</button>
  <button name="wizard_goto_step" type="submit" value="{{ wizard.steps.prev }}">"prev step"</button>
  {% endif %}

  <input type="submit" value="Submit" />
  </form>
</body>
</html>

编辑:我注意到的一个是:在编辑模式下，即当我在以下url: http://127.0.0.1:8000/wizard/edit/1/时，它正确地显示了第一个表单数据，当我点击提交时，它没有带我到编辑模式的步骤2，即URL更改为http://127.0.0.1:8000/wizard/create/。

如果在第一步中单击编辑url上的submit(如/wizard/edit/1)，则保持相同的url，那么表单将在下一步中获得其初始数据。但我不知道如何避免url从更改为/wizard/create

这个错误看起来微不足道。在您的模板中，表单动作有wizards url，这是创建视图的url。因此，当表单提交时，它将转到/wizard/create。

为了能够在两个视图中使用模板，您可以从form标记中删除action属性。该表单将被提交到当前的url，可以创建或编辑。

所以把你的模板改成form标签为

<form method="post" enctype="multipart/form-data">

编辑:保存项目

将视图更新为:

def done(self, form_list, **kwargs):
        for form in form_list:
           print form.initial
        if not self.request.user.is_authenticated():
                raise Http404
        id = form_list[0].cleaned_data['id']
        try:
                item = Item.objects.get(pk=id)
                print item
                instance = item
        except:
                item = None
                instance = None
        if item and item.user != self.request.user:
                print "about to raise 404"
                raise Http404
        if not item:
                instance = Item()
        #moved for out of if
        for form in form_list:
            for field, value in form.cleaned_data.iteritems():
                setattr(instance, field, value)
        instance.user = self.request.user
        instance.save()
        return render_to_response('wizard-done.html', {
                'form_data': [form.cleaned_data for form in form_list], })

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