flask_wtf 中无法识别自定义验证器

Question

我有这个注册表

class RegistrationForm(FlaskForm):
    username = StringField("username", validators=[InputRequired(), Length(min=4, max=7, message="must be between 4 and 7 Chars long")])
    email = StringField("Email", validators=[DataRequired(), Email()])
    password = PasswordField('Password', validators=[DataRequired()])
    password_repeat = PasswordField('repeat Password', validators=[DataRequired(), EqualTo('password')])
    submit = SubmitField('sign Up')

    def validate_username(self, username):
        user = User.query.filter_by(username=username.data).first()
        if user is not None:
            raise ValidationError('username allready taken.')

    def validate_email(self, email):
        user = User.query.filter_by(email=email.data).first()
        if user is not None:
            raise ValidationError('email already taken.')

    def validate_name(form, username):
        if 't' in username.data:
            raise ValidationError('no t pls')

我想构建一个自定义验证器来检查例如输入的用户名是否包含字母“t” 如果是这样显示ValidationError

 def validate_name(form, username):
        if 't' in username.data:
            raise ValidationError('no t pls') 

如果我正确理解了Custom validators 上的文档

语法应该是正确的，但是在插入和提交数据时我没有收到错误消息
我在routes中使用if form.validate_on_submit():

Answer 1

def validate_name(form, username):
    if 't' in username.data:
        raise ValidationError('no t pls')

您必须传入self，而不是表单。

def validate_name(self, username):
    if 't' in username.data:
        raise ValidationError('no t pls')