如何为UserCreationForm中的特定输入引发错误？

问题描述

我正在尝试引发一个错误，告诉用户用户名或电子邮件已经存在。我在注册过程中使用了UserCreationForm，并使用ValidationError来验证表单，如下所示：

# UserCreationForm
class SignUp(UserCreationForm):
    email = forms.EmailField(required=True)
    first_name = forms.CharField(required=True)
    last_name = forms.CharField(required=True)

    class Meta:
        model = User
        fields = ['username','first_name','last_name','password1','password2','email']

    def clean_username(self):
        username = self.cleaned_data.get('username')
        if User.objects.filter(username=username).exists():
            return forms.ValidationError('username is already exists')
        return username

    def clean_email(self):
        email = self.cleaned_data.get('email')
        if User.objects.filter(email=email).exists():
            raise forms.ValidationError('email is already exists')
        return email

但是当我按Enter键看到错误时，我得到了该错误：

Traceback (most recent call last):
  File "/media/medo/BE4C6BE74C6B98C3/Cources/Django/all git/Django projects/Es2al/Es2al2/website/venv/lib/python3.8/site-packages/django/core/handlers/exception.py",line 47,in inner
    response = get_response(request)
  File "/media/medo/BE4C6BE74C6B98C3/Cources/Django/all git/Django projects/Es2al/Es2al2/website/venv/lib/python3.8/site-packages/django/core/handlers/base.py",line 202,in _get_response
    response = response.render()
  File "/media/medo/BE4C6BE74C6B98C3/Cources/Django/all git/Django projects/Es2al/Es2al2/website/venv/lib/python3.8/site-packages/django/template/response.py",line 105,in render
    self.content = self.rendered_content
  File "/media/medo/BE4C6BE74C6B98C3/Cources/Django/all git/Django projects/Es2al/Es2al2/website/venv/lib/python3.8/site-packages/django/template/response.py",line 83,in rendered_content
    return template.render(context,self._request)
  File "/media/medo/BE4C6BE74C6B98C3/Cources/Django/all git/Django projects/Es2al/Es2al2/website/venv/lib/python3.8/site-packages/django/template/backends/django.py",line 61,in render
    return self.template.render(context)
  File "/media/medo/BE4C6BE74C6B98C3/Cources/Django/all git/Django projects/Es2al/Es2al2/website/venv/lib/python3.8/site-packages/django/template/base.py",line 168,in render
    with context.bind_template(self):
  File "/usr/lib/python3.8/contextlib.py",line 113,in __enter__
    return next(self.gen)
  File "/media/medo/BE4C6BE74C6B98C3/Cources/Django/all git/Django projects/Es2al/Es2al2/website/venv/lib/python3.8/site-packages/django/template/context.py",line 244,in bind_template
    updates.update(processor(self.request))

Exception Type: ValueError at /accounts/register/
Exception Value: dictionary update sequence element #0 has length 202; 2 is required

注册视图很简单：

class Register(CreateView):
    template_name = 'accounts/register.html'
    form_class = SignUp
    success_url = reverse_lazy('accounts:login')

那么，在这种情况下，如何处理从表单到用户名和电子邮件的错误消息？

解决方法

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