验证字段和提交模型（更改用户电子邮件）

Django 中已经实现了用于更改用户密码的表单，其中一个例子是 SetPasswordForm 。

但是，没有用于修改用户电子邮件的表单，我认为以下示例对于了解如何正确使用表单非常重要。

以下示例执行以下检查：

• 电子邮件实际上已经改变 - 如果你需要验证电子邮件或更新邮件黑猩猩，这非常有用;
• 电子邮件和确认电子邮件都是相同的 - 表单有两个电子邮件字段，因此更新不易出错。

最后，它将新电子邮件保存在用户对象中（更新用户电子邮件）。请注意，__init__() 方法需要一个用户对象。

class EmailChangeForm(forms.Form):
    """
    A form that lets a user change set their email while checking for a change in the 
    e-mail.
    """
    error_messages = {
        'email_mismatch': _("The two email addresses fields didn't match."),
        'not_changed': _("The email address is the same as the one already defined."),
    }

    new_email1 = forms.EmailField(
        label=_("New email address"),
        widget=forms.EmailInput,
    )

    new_email2 = forms.EmailField(
        label=_("New email address confirmation"),
        widget=forms.EmailInput,
    )

    def __init__(self, user, *args, **kwargs):
        self.user = user
        super(EmailChangeForm, self).__init__(*args, **kwargs)

    def clean_new_email1(self):
        old_email = self.user.email
        new_email1 = self.cleaned_data.get('new_email1')
        if new_email1 and old_email:
            if new_email1 == old_email:
                raise forms.ValidationError(
                    self.error_messages['not_changed'],
                    code='not_changed',
                )
        return new_email1

    def clean_new_email2(self):
        new_email1 = self.cleaned_data.get('new_email1')
        new_email2 = self.cleaned_data.get('new_email2')
        if new_email1 and new_email2:
            if new_email1 != new_email2:
                raise forms.ValidationError(
                    self.error_messages['email_mismatch'],
                    code='email_mismatch',
                )
        return new_email2

    def save(self, commit=True):
        email = self.cleaned_data["new_email1"]
        self.user.email = email
        if commit:
            self.user.save()
        return self.user

def email_change(request):
    form = EmailChangeForm()
    if request.method=='POST':
        form = Email_Change_Form(user,request.POST)
        if form.is_valid():
            if request.user.is_authenticated:
                if form.cleaned_data['email1']  == form.cleaned_data['email2']:
                    user = request.user
                    u = User.objects.get(username=user)
                    # get the proper user
                    u.email = form.cleaned_data['email1'] 
                    u.save()
                    return HttpResponseRedirect("/accounts/profile/")
    else:
        return render_to_response("email_change.html", {'form':form},
                                   context_instance=RequestContext(request))