Form组件钩子自定义验证

def _clean_fields(self):
    for name, field in self.fields.items():
        # value_from_datadict() gets the data from the data dictionaries.
        # Each widget type knows how to retrieve its own data, because some
        # widgets split data over several HTML fields.
        if field.disabled:
            value = self.get_initial_for_field(field, name)
        else:
            value = field.widget.value_from_datadict(self.data, self.files, self.add_prefix(name))
        try:
            if isinstance(field, FileField):
                initial = self.get_initial_for_field(field, name)
                value = field.clean(value, initial)
            else:
                value = field.clean(value)
            self.cleaned_data[name] = value
            if hasattr(self, ‘clean_%s‘ % name):
                value = getattr(self, ‘clean_%s‘ % name)()
                self.cleaned_data[name] = value
        except ValidationError as e:
            self.add_error(name, e)

针对一个字段做验证的时候使用clean_%s自定义验证


def clean_username(self):
    username = self.cleaned_data.get("username")
    username_exist = models.UserInfo.objects.filter(username=username)
    if username_exist:
        self.add_error("username",ValidationError("用户名已存在"))

def clean_phone(self):
    phone = self.cleaned_data.get(‘phone‘)
    phone_exist = models.UserInfo.objects.filter(phone=phone)
    if phone_exist:
        self.add_error(‘phone‘, ValidationError("手机号码已存在"))

针对多个字段做验证的时候使用clean自定义验证

def clean(self):
    pwd1 = self.cleaned_data.get(‘password‘)
    pwd2 = self.cleaned_data.get(‘re_password‘)

    if pwd1 == pwd2:
        pass
    else:
        self.add_error(‘re_password‘, ValidationError(‘密码输入不一致‘))