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我想添加一些额外的字段用于我的django应用程序中的用户注册。用户可以成功注册但额外的字段，如first_name，last_name和电子邮件不保存在数据库中。Django注册不保存数据库中的额外字段
请帮助我！
这里是我的forms.py：
class SignUpForm(UserCreationForm):
first_name = forms.CharField(max_length=30, required=False, help_text='Optional.')
last_name = forms.CharField(max_length=30, required=False, help_text='Optional.')
email = forms.EmailField(max_length=254, help_text='Required. Inform a valid email address.')
class Meta:
model = User
fields = ('username', 'first_name', 'last_name', 'email', 'password1', 'password2',)
def save(self, commit=True):
user = super(SignUpForm, self).save(commit=False)
user.email = self.cleaned_data['email']
user.first_name = self.cleaned_data['first_name']
user.last_name = self.cleaned_data['last_name']
if commit:
user.save()
return user
这里的views.py：
class SignUpView(generic.CreateView):
form_class = UserCreationForm
template_name = 'users/signup.html'
success_url = reverse_lazy('users:login')