自定义form表单验证

Posted 2020-10-08

方式一：RegexValidator对象

from django.core.validators import RegexValidator

phone = fields.CharField(

    validators=[RegexValidator(r‘^[0-9]+$‘, ‘请输入数字‘), RegexValidator(r‘^159[0-9]+$‘, ‘数字必须以159开头‘)])   # 自定义验证规则进行验证


方式二：函数

from django.core.exceptions import ValidationError

def mobile_validate(value):
    mobile_re = re.compile(r‘^(13[0-9]|15[012356789]|17[678]|18[0-9]|14[57])[0-9]{8}$‘)
    if not mobile_re.match(value):
        raise ValidationError(‘手机号码格式错误‘)

phone = fields.CharField(
        validators=[mobile_validate,])   # 自定义验证规则进行验证



方式三：钩子函数
1,分析

 

 

 

 

通过上面分析1，通过_clean_fields实现

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)


通过上面可以实现

def clean_phone(self):
    # 去取用户提交的值：可能是错误的，可能是正确
    value = self.cleaned_data[‘phone‘]
    mobile_re = re.compile(r‘^(13[0-9]|15[012356789]|17[678]|18[0-9]|14[57])[0-9]{8}$‘)
    if not mobile_re.match(value):
        raise ValidationError(‘手机号码格式错误‘)

    if models.UserInfo.objects.filter(phone=value).count():
        raise ValidationError(‘手机号码已经存在‘)

    return value

注意钩子字段只能取自己的。不然可能取不到。源码是通过__dict__取得

 

执行流程  1，正则表达式
　　　　  2,clean钩子函数