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‘))