Django:未保存具有动态表单字段的CreateView对象

时间:2018-11-21 13:19:38

标签: python django django-forms create-view

我设置了一个可以正常工作的CreateView。但是,当我将其中一个模型形式字段('erlaubte_pruefer')动态化时,将不再保存该对象。

我尝试了其他帖子中建议的许多解决方案,例如 -get user variable在get_form_kwargs()中, -在limit the field choices中使用get_form()代替forms.py -不要使用CreateView

但是我无法使其正常工作。我没有收到错误或异常,表单仅再次呈现。

非常感谢您的投入。谢谢!

forms.py

class Checklisten_Reinigung_Form(forms.ModelForm):

    class Meta:
        model = Checklisten_Reinigung
        fields = ['okay',
              'raum_verbindung',
              'ausfuehrer',
              'erlaubte_pruefer'
              ]

    # user should only choose from those objects that were created by himself
    def __init__(self, user, *args, **kwargs):
        super(Checklisten_Reinigung_Form, self).__init__(*args, **kwargs)
        self.fields['erlaubte_pruefer'].queryset = 
                   Pruefer.objects.filter(firmenzugehoerigkeit=user)

views.py

class Checklisten_Reinigung_Create_View(LoginRequiredMixin, CreateView):
    template_name = 'checklisten/checklisten_form.html'

    def get_context_data(self, **kwargs):
        context = super(Checklisten_Reinigung_Create_View, 
                        self).get_context_data(**kwargs)
        context['mymodel'] = Checklisten_Reinigung()
        return context

    # if I leave out get_form() the object is successfully saved
    # but the user's choice is not limited

    def get_form(self, form_class=None):
        form = Checklisten_Reinigung_Form(user=self.request.user)
        return form

    def form_valid(self, form):
        self.object = form.save(commit=False)

        try:
            self.object.pruefende_firma = self.request.user
            self.object.bezeichnung = self.object.bezeichnung
            self.object.ausfuehrer = form.cleaned_data['ausfuehrer']
            self.object.erlaubte_pruefer = 
                  form.cleaned_data['erlaubte_pruefer']
            self.object.okay = form.cleaned_data['okay']
            self.object.raum_verbindung= form.cleaned_data['raum_verbindung']
            self.object.save()


            return HttpResponseRedirect(self.get_success_url())

        except:
            messages.error(self.request, 'Es ist ein Fehler aufgetreten.')
            return self.render_to_response(self.get_context_data(form=form(user=self.request.user)))

    def get_success_url(self):
        messages.success(self.request, 'Checkliste erfolgreich gespeichert.')
        return reverse('checkliste-startseite')

编辑:

谢谢@Daniel Rosemann的回复。我将您的代码包含在我的代码中,但出现此错误:

Traceback:

File "C:\Users\Mars\Anaconda3\lib\site-packages\django\core\handlers\exception.py" in inner
  34.             response = get_response(request)

File "C:\Users\Mars\Anaconda3\lib\site-packages\django\core\handlers\base.py" in _get_response
  126.                 response = self.process_exception_by_middleware(e, request)

File "C:\Users\Mars\Anaconda3\lib\site-packages\django\core\handlers\base.py" in _get_response
  124.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "C:\Users\Mars\Anaconda3\lib\site-packages\django\views\generic\base.py" in view
  68.             return self.dispatch(request, *args, **kwargs)

File "C:\Users\Mars\Anaconda3\lib\site-packages\django\contrib\auth\mixins.py" in dispatch
  52.         return super().dispatch(request, *args, **kwargs)

File "C:\Users\Mars\Anaconda3\lib\site-packages\django\views\generic\base.py" in dispatch
  88.         return handler(request, *args, **kwargs)

File "C:\Users\Mars\Anaconda3\lib\site-packages\django\views\generic\edit.py" in get
  168.         return super().get(request, *args, **kwargs)

File "C:\Users\Mars\Anaconda3\lib\site-packages\django\views\generic\edit.py" in get
  133.         return self.render_to_response(self.get_context_data())

File "C:\Users\Mars\Desktop\morecooking_now\morecooking_now\checklisten\views.py" in get_context_data
  372.         context = super(Checklisten_Reinigung_Create_View, self).get_context_data(**kwargs)

File "C:\Users\Mars\Anaconda3\lib\site-packages\django\views\generic\edit.py" in get_context_data
  66.             kwargs['form'] = self.get_form()

File "C:\Users\Mars\Anaconda3\lib\site-packages\django\views\generic\edit.py" in get_form
  32.             form_class = self.get_form_class()

File "C:\Users\Mars\Anaconda3\lib\site-packages\django\views\generic\edit.py" in get_form_class
  93.                 model = self.get_queryset().model

File "C:\Users\Mars\Anaconda3\lib\site-packages\django\views\generic\detail.py" in get_queryset
  73.                         'cls': self.__class__.__name__

Exception Type: ImproperlyConfigured at /checklisten/reinigung/neu/
Exception Value: Checklisten_Reinigung_Create_View is missing a QuerySet. Define Checklisten_Reinigung_Create_View.model, Checklisten_Reinigung_Create_View.queryset, or override Checklisten_Reinigung_Create_View.get_queryset().

再次感谢您!

1 个答案:

答案 0 :(得分:1)

您已经更改了表单的签名,因此第一个位置参数现在为user,而不是data。但是您已经将get_form定义为仅通过user,而永远不会通过data;因此表单永远不会获取任何数据,因此永远不会有效。

改为给用户一个变态:<​​/ p>

def __init__(self, *args, **kwargs):   # no user here
    user = kwargs.pop('user', None)
    super(Checklisten_Reinigung_Form, self).__init__(*args, **kwargs)
    self.fields['erlaubte_pruefer'].queryset = 
               Pruefer.objects.filter(firmenzugehoerigkeit=user)

,然后在视图中,删除您对get_form的定义,而是定义get_form_kwargs以通过用户:

def get_form_kwargs(self):
    kwargs = super().get_form_kwargs()
    kwargs['user'] = self.request.user
    return kwargs

还请注意,您在form_valid中做的工作太多;对form.save的调用已经在表格中设置了字段,例如“ erlaubte_pruefer”和“ okay”,因此您无需手动设置它们。

(最后,盲目地捕获所有错误并只返回模糊的“发生错误”消息是绝对没有用的。这隐藏了日志记录,该日志记录将告诉您发生了什么,并且不会给用户任何有用的信息。仅捕获您知道将要处理的错误;删除该try / except并让Django显示默认错误页面。)