python - AttributeError at/accounts/signup/'str' 对象没有属性 'add'

Question

我是 Django 的新手，所以我在这方面使用了实际示例 tutorial在使用用户配置文件扩展用户模型时，我在 form.py 上遇到了问题，它在删除此行时给出了该错误；supervisor.su_mobile_number.add(*self.cleaned_data.get('su_mobile_number'))它运行顺利，但没有将 su_mobile_number 的数据插入数据库

view.py

class SupervisorSignUpView(CreateView):
     model = User
     form_class = SupervisorSignUpForm
     template_name = 'registration/signup_form.html'

def get_context_data(self, **kwargs):
    kwargs['user_type'] = 'supervisor'
    return super().get_context_data(**kwargs)

def form_valid(self, form):
    user = form.save()
    login(self.request, user)
    return redirect('home')

模型.py

class User(AbstractUser):
   is_supervisor = models.BooleanField(default=False)
   is_student = models.BooleanField(default=False)


class Supervisor(models.Model):
   user = models.OneToOneField('User', on_delete=models.CASCADE, primary_key=True, related_name='supervisor')
   su_mobile_number = models.CharField(max_length=200)

表单.py

class SupervisorSignUpForm(UserCreationForm):
 su_mobile_number = forms.CharField()

class Meta(UserCreationForm.Meta):
    model = User

@transaction.atomic
def save(self):
    user = super().save(commit=False)
    user.is_supervisor = True
    user.save()
    supervisor = Supervisor.objects.create(user=user)
    supervisor.su_mobile_number.add(*self.cleaned_data.get('su_mobile_number'))
    return user

Answer 1

使用=运算符赋值，然后调用save()方法

@transaction.atomic
def save(self):
    user = super().save(commit=False)
    user.is_supervisor = True
    user.save()
    supervisor = Supervisor.objects.create(user=user)
    <b>supervisor.su_mobile_number = self.cleaned_data.get('su_mobile_number')
    supervisor.save()</b>
    return user

---

更短的方法是(如@Abdul Niyas P M所述)

@transaction.atomic
def save(self):
    user = super().save(commit=False)
    user.is_supervisor = True
    user.save()
    <b>supervisor = Supervisor.objects.create(user=user, su_mobile_number=self.cleaned_data.get('su_mobile_number'))</b>
    return user