Django UpdateView（CBV/FBV）多文件上传失败，提示必填字段错误

尝试通过更新模板，使用UpdateView实现单文件和多文件上传，但提交时始终出现此字段为必填项错误，文件无法上传。所有必填字段均已填写有效数据类型，且文件上传字段为可选，无法定位错误来源。

已尝试基于函数的视图（FBV）和基于类的视图（CBV），问题依旧；甚至为多文件上传字段创建单独模型，以及继承updateCoopForm类的单独表单类，仍未解决问题。怀疑视图中的if form.is_valid():部分存在错误。

多文件上传字段模型 #

class shareCapitalFiles(models.Model):
    # Foreign key
    coopform = models.ForeignKey(CoopForm, on_delete=models.CASCADE)
    
    # Attach evidence of share capital
    attach_share_capital = models.FileField('Attach Share Capital', upload_to="documents", blank=True)

forms.py代码 #

# Update Form
class updateCoopForm(forms.ModelForm):    
    nature_registration = forms.ChoiceField(widget=forms.RadioSelect(attrs={'class': 'flex inline-flex', 'cursor': 'pointer'}), choices=CoopForm.REGISTRATION_TYPE)
    have_bye_laws = forms.ChoiceField(widget=forms.RadioSelect(attrs={'class': 'flex inline-flex', 'cursor': 'pointer'}), choices=CoopForm.BYE_LAWS_CHOICES)
    attach_bye_laws = forms.FileField(required=False)
    
    class Meta: 
        model = CoopForm 
        fields = '__all__'
        widgets = { 
                   'first_purpose': forms.Textarea(attrs={'rows':2}),
                   'second_purpose': forms.Textarea(attrs={'rows':2}),
                   'third_purpose': forms.Textarea(attrs={'rows':2}),
                   'first_origin_meeting_date': forms.DateInput(attrs={'type': 'date'}),
                   'second_origin_meeting_date': forms.DateInput(attrs={'type': 'date'})
                }
        

class shareCapitalForm(updateCoopForm):
    attach_share_capital = forms.FileField(label='Attach Share Capital',widget=forms.ClearableFileInput(attrs={'multiple': True}), required=False)

    class Meta(updateCoopForm.Meta):
        fields = updateCoopForm.Meta.fields

CBV代码 #

class updateFormView(UpdateView):
    model = CoopForm
    form_class = shareCapitalForm
    context_object_name = 'obj' 
    template_name = 'updateform.html'
    
    def get_queryset(self):
        return CoopForm.objects.all()

    def get_success_url(self):
        return reverse('formdetails', kwargs={'pk': self.object.id})
    
    def get_context_data(self, **kwargs):
        context = super(updateFormView, self).get_context_data(**kwargs)
        if self.request.POST:
            context['form'] = shareCapitalForm(self.request.POST, self.request.FILES, nstance=self.object)
        else:
            context['form'] = shareCapitalForm(instance=self.object)
        return context
    
    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        form_class = self.get_form_class()
        form = self.get_form(form_class)
        files = self.request.FILES.getlist('attach_share_capital')

        if form.is_valid():
            update = form.save(commit=False)
            if files:
                for f in files:
                    instance = shareCapitalFiles.objects.create(coopform=update, attach_share_capital=f)
                    instance.save()                   
                messages.success(request, 'Files uploaded successfully')
            #update.author = self.request.user
            update.save()
            
            return self.form_valid(form)
        
        else:
            return self.form_invalid(form)

FBV代码 #

def updateformview(request, pk, *args, **kwargs):    
    # fetch the object related to passed id
    obj = get_object_or_404(CoopForm, id=pk)
    
    # pass the object as instance in form
    form = shareCapitalForm(request.POST or None, request.FILES or None, instance=obj)
    
    # get the template
    template = loader.get_template('updateform.html')

    # if the form is being updated
    if request.method == 'POST':           
        
        # retrieve multiples files from model field
        files = request.FILES.getlist('attach_share_capital')          
            
        # save the data from the form and
        # redirect to detail_view
        if form.is_valid(): 
            update = form.save(commit=False)
            update.save()
            
            if files:
                for f in files:
                    instance = shareCapitalFiles.objects.create(coopform=update, attach_share_capital=f)
                    instance.save()
            return HttpResponseRedirect(reverse('formdetails', kwargs={'pk': id}))
        
    context = { 
               'form': form, 
               'obj': obj 
            }
    
    return HttpResponse(template.render(context, request))

多文件上传字段HTML代码 #

<div class="grid gap-6 mt-1 mx-auto md:grid-cols-2 lg:grid-cols-2 px-6 pt-4 pb-8 bg-stone-50 border border-1 border-gray-300 shadow-md">                            

    <!-- Attach Share Capital -->
    <div>
        <label for="attach_share_capital" class="block mb-2 text-md font-bold text-gray-500">
            {{ form.attach_share_capital.label }}
        </label>
        {% render_field form.attach_share_capital class+="cursor-pointer text-md md:text-md font-medium block rounded-sm w-full p-2 border border-2 border-gray-300 placeholder-gray-500 text-gray-600 focus:outline-none focus:ring-indigo-500 focus:border-indigo-500" %}  
        <p class="mt-1 text-sm text-gray-500">PDF, DOC (WORD), PNG OR JPG formats only. You can attach multiple files</p>
    </div>
    {% if form.errors.attach_share_capital %}
        <span class="text-red-600 font-medium">{{ form.errors.attach_share_capital }}</span>
    {% endif %}
</div>

内容的提问来源于stack exchange，提问作者Uwa Isibor