自定义表单验证

Question

我有一个非常简单的表单：

from django import forms

class InitialSignupForm(forms.Form):
    email = forms.EmailField()
    password = forms.CharField(max_length=255, widget = forms.PasswordInput)
    password_repeat = forms.CharField(max_length=255, widget = forms.PasswordInput)

    def clean_message(self):
        email = self.clean_data.get('email', '')
        password = self.clean_data.get('password', '')
        password_repeat = self.clean_data.get('password_repeat', '')

        try:
            User.objects.get(email_address = email)
            raise forms.ValidationError("Email taken.")
        except User.DoesNotExist:
            pass

        if password != password_repeat:
            raise forms.ValidationError("The passwords don't match.")

这就是自定义表单验证的方式吗？我需要在email上评估当前没有使用该电子邮件地址的用户。我还需要评估password和password_repeat的匹配度。我该怎么做呢？

Answer 1

要单独验证单个字段，可以在表单中使用clean_FIELDNAME()方法，因此对于电子邮件：

def clean_email(self):
    email = self.cleaned_data['email']
    if User.objects.filter(email=email).exists():
        raise ValidationError("Email already exists")
    return email

然后，对于相互依赖的相互依赖的字段，您可以覆盖表单clean()方法，该方法在所有字段(如上面的email )单独验证后运行：

def clean(self):
    form_data = self.cleaned_data
    if form_data['password'] != form_data['password_repeat']:
        self._errors["password"] = ["Password do not match"] # Will raise a error message
        del form_data['password']
    return form_data

我不确定您从哪里获得clean_message()，但它看起来像是为表单中不存在的message字段创建的验证方法。

请通读本文以了解更多详细信息：

https://docs.djangoproject.com/en/dev/ref/forms/validation/