当我们自动想要设置用户名时，Django最佳实践

Question

在我的webapp中，我想使用其电子邮件地址自动设置Django用户的用户名字段。目前我在调用我的表单的 is_valid（）方法之前在视图中执行此操作。但我不应该在表单的 clean（）方法中进行操作吗？

我的表格：

from django.contrib.auth.forms import UserCreationForm

class DjangoUserCreateForm(UserCreationForm):
    required_css_class = 'required-field'

    def __init__(self, *args, **kwargs):
        super(DjangoUserCreateForm, self).__init__(*args, **kwargs)
        # Making fields required
        self.fields['first_name'].required = True
        self.fields['last_name'].required = True
        self.fields['email'].required = True
        self.fields['password1'].required = True
        self.fields['password2'].required = True

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

以下是观点：

class MyView(TemplateView):
    ...
    def post(self, request, *args, **kwargs):
        user_form = DjangoUserForm(request.POST)
        if user_form.is_valid():
            user = user_form.save(commit=False)
            # In our system the email is also the username
            user.username = user_form.cleaned_data['email']
            user.save()
        ...