python - str 没有在 django 中添加对象

Question

运行manage.py时收到此错误消息

AttributeError at /accounts/signup/teacher/ 'str' object has no attribute 'add'

这是我写的代码->表单.py

class TeacherSignUpForm(UserCreationForm):
    email = forms.EmailField(max_length=100)
    firstname = forms.CharField(max_length=100)
    lastname = forms.CharField(max_length=100)
    phonenumber = forms.IntegerField(required=True)
    linkedin = forms.URLField(max_length=200)

    class Meta(UserCreationForm.Meta):
        model = User

    def save(self, commit=True):
        user = super().save(commit=False)
        user.is_teacher = True
        if commit:
            user.save()
        mentor = Mentor.objects.create(user=user)
        mentor.email.add(*self.cleaned_data.get('email'))
        mentor.firstname.add(*self.cleaned_data.get('firstname'))
        mentor.lastname.add(*self.cleaned_data.get('lastname'))
        mentor.phonenumber.add(*self.cleaned_data.get('phonenumber'))
        mentor.linkedin.add(*self.cleaned_data.get('linkedin'))
        return user

模型.py

#mentor model
class Mentor(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE, primary_key=True)
    email = models.EmailField(max_length=100)
    firstname = models.CharField(max_length=100)
    lastname = models.CharField(max_length=100)
    linkedin = models.URLField(max_length=200,null=True,blank=True)
    phonenumber = models.IntegerField(null=True,unique=True)

和 View

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

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

    def form_valid(self, form):
        user = form.save()
        login(self.request, user)
        return redirect('teachers:app-instructor-dashboard')

当我尝试以导师/老师身份登录时，收到此错误消息。然后应该将我重定向到 app-instructor-dashboard

Answer 1

你的观点没有多大意义。 EmailField 和 UrlField 与带有一些额外验证的 CharField 没什么区别。这些不是电子邮件的集合(列表等)。

因此，您应该分配如下值:

class TeacherSignUpForm(UserCreationForm):
    email = forms.EmailField(max_length=100)
    firstname = forms.CharField(max_length=100)
    lastname = forms.CharField(max_length=100)
    phonenumber = forms.IntegerField(required=True)
    linkedin = forms.URLField(max_length=200)

    class Meta(UserCreationForm.Meta):
        model = User

    def save(self, commit=True):
        self.instance.is_teacher = True
        <b>user = super().save()</b>
        mentor = Mentor.objects.create(
            user=user,
            email=self.cleaned_data['email'],
            firstname=self.cleaned_data['firstname'],
            lastname=self.cleaned_data['lastname'],
            phonenumber=self.cleaned_data['phonenumber'],
            linkedin=self.cleaned_data['linkedin']
        )
        return user

请注意，必须首先保存user对象。不是在数据库端创建的 User 对象不能用于创建 Mentor 对象，因为它没有主键一起工作。