validator(form, self) TypeError: init() takes from 1 to 2 positional arguments but 3 were given

秒速五厘米 2023-05-31 10:19 7阅读 0赞

注册表单如下：

class RegistrationForm(FlaskForm):
        username = StringField("用户名", validators=[DataRequired()])
        email = StringField("邮箱", validators=[DataRequired(), Email()])
        password = PasswordField("密码", validators=[DataRequired])
        password2 = PasswordField("确认密码", validators=[DataRequired(), EqualTo('password')])
        submit = SubmitField("注册")

在运行过程中报错：

Traceback (most recent call last):
      File "E:\技术资料\接口框架\mockenv\lib\site-packages\flask\app.py", line 2292, in wsgi_app
        response = self.full_dispatch_request()
      File "E:\技术资料\接口框架\mockenv\lib\site-packages\flask\app.py", line 1815, in full_dispatch_request
        rv = self.handle_user_exception(e)
      File "E:\技术资料\接口框架\mockenv\lib\site-packages\flask\app.py", line 1718, in handle_user_exception
        reraise(exc_type, exc_value, tb)
      File "E:\技术资料\接口框架\mockenv\lib\site-packages\flask\_compat.py", line 35, in reraise
        raise value
      File "E:\技术资料\接口框架\mockenv\lib\site-packages\flask\app.py", line 1813, in full_dispatch_request
        rv = self.dispatch_request()
      File "E:\技术资料\接口框架\mockenv\lib\site-packages\flask\app.py", line 1799, in dispatch_request
        return self.view_functions[rule.endpoint](**req.view_args)
      File "E:\技术资料\接口框架\mockenv\lib\site-packages\flask\views.py", line 88, in view
        return self.dispatch_request(*args, **kwargs)
      File "E:\技术资料\接口框架\myMockServer\mytools\login\login_views.py", line 93, in dispatch_request
        if form.validate_on_submit():
      File "E:\技术资料\接口框架\mockenv\lib\site-packages\flask_wtf\form.py", line 101, in validate_on_submit
        return self.is_submitted() and self.validate()
      File "E:\技术资料\接口框架\mockenv\lib\site-packages\wtforms\form.py", line 310, in validate
        return super(Form, self).validate(extra)
      File "E:\技术资料\接口框架\mockenv\lib\site-packages\wtforms\form.py", line 152, in validate
        if not field.validate(self, extra):
      File "E:\技术资料\接口框架\mockenv\lib\site-packages\wtforms\fields\core.py", line 206, in validate
        stop_validation = self._run_validation_chain(form, chain)
      File "E:\技术资料\接口框架\mockenv\lib\site-packages\wtforms\fields\core.py", line 227, in _run_validation_chain
        validator(form, self)
    TypeError: __init__() takes from 1 to 2 positional arguments but 3 were given

百度了一下，表单校验DataRequired是一个函数，改成DataRequired()，运行成功.

class RegistrationForm(FlaskForm):
        username = StringField("用户名", validators=[DataRequired()])
        email = StringField("邮箱", validators=[DataRequired(), Email()])
        password = PasswordField("密码", validators=[DataRequired()])
        password2 = PasswordField("确认密码", validators=[DataRequired(), EqualTo('password')])
        submit = SubmitField("注册")

参考文章：  
https://blog.csdn.net/birdflyinhigh/article/details/79557990