我正在嘗試在我的應用程序中實現 ModelMultipleChoiceField，如下所示：鏈接model.pyclass Services(models.Model): id = models.AutoField(primary_key=True) type = models.CharField(max_length=300)class Professionals_Services(models.Model): professional = models.ForeignKey(User, on_delete=models.CASCADE) service = models.ForeignKey(Services, on_delete=models.CASCADE)form.pyclass ProfileServicesUpdateForm(forms.ModelForm): service = forms.ModelMultipleChoiceField(required=False, queryset=Services.objects.all()) class Meta: model = Professionals_Services fields = ['service'] def clean(self): # this condition only if the POST data is cleaned, right? cleaned_data = super(ProfileServicesUpdateForm, self).clean() print(cleaned_data.get('service'))view.pyclass EditProfileServicesView(CreateView): model = Professionals_Services form_class = ProfileServicesUpdateForm context_object_name = 'services' template_name = 'accounts/edit-profile.html' @method_decorator(login_required(login_url=reverse_lazy('professionals:login'))) def dispatch(self, request, *args, **kwargs): return super().dispatch(self.request, *args, **kwargs) def post(self, request, *args, **kwargs): form = self.form_class(data=request.POST) if form.is_valid(): services = form.save(commit=False) services.save()html<select class="ui search fluid dropdown" multiple="" name="service" id="id_service"> {% for service in services_list %} <option value="{{ service.id }}">{{ service.type }}</option> {% endfor %}</select>對于開發，我使用 Pycham Professionals（最新版本）和 docker，當我運行應用程序并嘗試發布 POST 時，答案是：Cannot assign "<QuerySet [<Services: Services object (2)>, <Services: Services object (5)>, <Services: Services object (6)>, <Services: Services object (7)>]>": "Professionals_Services.service" must be a "Services" instance.但是，如果我在調試模式下運行應用程序并在應用程序上設置斷點，則if form.is_valid(): 應用程序可以正常工作那是因為 validate 等于 Unknown not in debug你知道如何修復嗎？
1 回答
Helenr
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你的service是ForeignKey：
? ? service = models.ForeignKey(Services, on_delete=models.CASCADE)
AForeignKey表示您選擇單個元素，而不是多個元素。您使用ManyToManyField[Django-doc]選擇多個元素：
class Professionals_Services(models.Model):
? ? professional = models.ForeignKey(User, on_delete=models.CASCADE)
? ? service = models.ManyToManyField(Service)
您也不應該重寫該post方法，并且可以使用LoginRequiredMixin[Django-doc]來確保用戶已登錄：
from django.contrib.auth.mixins import LoginRequiredMixin
class EditProfileServicesView(LoginRequiredMixin, CreateView):
? ? login_url = reverse_lazy('professionals:login')
? ? model = Professionals_Services
? ? form_class = ProfileServicesUpdateForm
? ? context_object_name = 'services'
? ? template_name = 'accounts/edit-profile.html'
? ? def form_valid(self, form):
? ? ? ? form.instance.user = self.request.user
? ? ? ? return super().form_valid(form)
在您中，Form您還應該返回清理后的數據：
class ProfileServicesUpdateForm(forms.ModelForm):
? ? service = forms.ModelMultipleChoiceField(required=False, queryset=Services.objects.all())
? ? class Meta:
? ? ? ? model = Professionals_Services
? ? ? ? fields = ['service']
? ? def clean(self):
? ? ? ? # this condition only if the POST data is cleaned, right?
? ? ? ? cleaned_data = super(ProfileServicesUpdateForm, self).clean()
? ? ? ? print(cleaned_data.get('service'))
? ? ? ? return cleaned_data
注意：通常使用
settings.AUTH_USER_MODEL[Django-doc]來引用用戶模型比直接使用User模型 [Django-doc]更好。
注意：Django 中的模型是用PerlCase編寫的，而不是Snake_case，因此您可能需要將模型從 重命名
Professionals_Services為ProfessionalService。
注意：通常 Django 模型有一個單一的名稱，所以
Services而不是Service.
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