DJANGO：如何根据基于类的视图验证多个表单？答案

【问题标题】：DJANGO: How to make validation of multiple forms based on class based views?DJANGO：如何根据基于类的视图验证多个表单？
【发布时间】：2018-08-31 01:57:12
【问题描述】：

我遇到了一次验证两个表单的问题。请帮帮我。我需要验证字段 username，但据我了解，我无法将 user_form 传递给 form_invalid 方法。

class TrainerCreateView(ActiveOnlyMixin, BrandOwnersPermissionMixin, CreateView):
    form_class = TrainerForm
    model = Trainer
    second_form_class = UserCreationForm

    def get_context_data(self, **kwargs):
        context = super(TrainerCreateView, self).get_context_data(**kwargs)
        context['user_form'] = self.second_form_class

    def form_valid(self, form):
        .......

    def form_invalid(self, form):
        return self.render_to_response(self.get_context_data(form=form))



from django.contrib.auth.forms import AuthenticationForm, UserCreationForm, UserChangeForm

class UserCreationForm(UserCreationForm):
    first_name = forms.CharField(required=True, label='Имя')
    last_name = forms.CharField(required=True, label='Фамилия')

    class Meta:
        model = User
        fields = ("email", "username", "password1", "password2", 'first_name', 'last_name')

    def clean_username(self):
        username = self.cleaned_data['username']
        if User.objects.exclude(pk=self.instance.pk).filter(username=username).exists():
            raise forms.ValidationError(u'Username "%s" is already in use.' % username)
        return username

谢谢！

【问题讨论】：

标签： django forms validation

【解决方案1】：

好吧，没人知道，我通过改变模型解决了这个问题，我的意思是 form_class 和 second_form_class。所以，我仍然无法同时验证两个表单，但我可以验证主表单（用户注册详细信息），可能这些信息会对某人有所帮助。

class TrainerCreateView(BrandOwnersPermissionMixin, CreateView):
    model = User
    form_class = UserCreationForm
    second_form_class = TrainerForm
    template_name = 'panel/accounts/trainer_form.html'

    def get_context_data(self, **kwargs):
        context = super(TrainerCreateView, self).get_context_data(**kwargs)
        return context

    def form_valid(self, form):
        try:
            trainer_form = TrainerForm(self.request.POST, self.request.FILES)
            with transaction.atomic():
                if form.is_valid() and trainer_form.is_valid():
                    user = form.save()
                    trainer = trainer_form.save(commit=False)
                    trainer.user_id = user.id
                    trainer_group = Group.objects.get(name='trainers')
                    trainer_group.user_set.add(user)
                    trainer.save()
        except Exception as e:
            print(e)
        return HttpResponseRedirect(self.get_success_url(self))

    def form_invalid(self, form):
        return self.render_to_response(self.get_context_data(form=form))

【讨论】：