我找到了相同問題的多個答案，但不幸的是，我似乎無法弄清楚:(該表單在我的模型“PhysicalPart”中有一個“子類別”字段的下拉列表，“子類別”字段的值在表單創建時動態更新（使用“類別”參數）。不幸的是，我無法讓下拉菜單顯示所有子類別并同時選擇數據庫中的一個。我似乎也無法從數據庫中檢索到“short_description”值。在我了解 UpdateView 類并決定改用它之前，它曾經可以工作......任何有關如何解決我的問題的見解將不勝感激！forms.pyclass PartForm(forms.ModelForm):subcategory = forms.ChoiceField(choices=[])class Meta:    model = PhysicalPart    fields = ['subcategory', 'short_description']views.pyclass PartUpdate(UpdateView):model = PhysicalParttemplate_name = 'part_update.html'form_class = PartFormdef post(self, request, *args, **kwargs):    # Load model instance    self.object = self.get_object()    # Load form    form = super(PartUpdate, self).get_form(self.form_class)    # Populating subcategory choices    form.fields['subcategory'].choices = SubcategoryFilter[self.object.category]    # Check if form valid and save data    if form.is_valid():        form.save()        return redirect('part-list')    # Update context before rendering    context = self.get_context_data(**kwargs)    context['part_id'] = self.object.pk    context['part_category'] = self.object.category    context['manufacturing_list'] = self.object.manufacturing.all()    return render(request, self.template_name, context)html<form action="{% url 'part-update' pk=part_id category=part_category %}" method="post" style="display: inline">    {% csrf_token %}    <div class="form">        <p class="font-weight-bold">Type</br>        {{ form.subcategory }}        </p>    </div>    <div class="form">        <p class="font-weight-bold">Short Description</br>        {{ form.short_description }}        </p>    </div>    <button type="submit" class="btn btn-primary">Save</button></form><form action="{% url 'part-list' %}" style="display: inline">    <button type="submit" class="btn btn-danger">Cancel</button></form>