express验证器-自定义密码验证器无法读取undefined的属性

Question

我有一个简单的验证器，用于检查"password"="passwordconf">

exports.RegisterUser=[

check('username').isLength({ min: 1 , max: 10}).trim().withMessage("Length 1-10"),
check('password').isLength({ min: 6 , max: 10}).trim().withMessage("Length 6-10"),
check('passwordconf').isLength({ min: 6 , max: 10}).trim().withMessage("Length 6-10"),
check('passwordconf').custom((value , { req }) => {
if (value !== req.body.password) {
throw new Error('Password confirmation is incorrect');
} 
}),
sanitizeBody('*').trim().escape(),
function ( req , res ) {
//check for errors
const errors = validationResult(req);
if (!errors.isEmpty()) {
return res.status(422).json({ errors: errors.array() });
} else {
var user = new User({
username : req.body.username,
password : req.body.password
});
var username = req.body.username;
//check if user is in DB
User.findOne({ 'username' : username})
.exec(( err , docs) => {
if (err) {
res.send('There was an error');
return err;
} else if (!docs) {
//username does not exist
user.save((err) => {
if (err) {
return next(err)
} else {
//saved it
res.send('saved a new user!')
}
})
} else {
res.send('Username exists!')
}                      
})}

}]

如果我对这句话发表评论，

check('passwordconf').custom((value , { req }) => {
if (value !== req.body.password) {
throw new Error('Password confirmation is incorrect');
} 
})

代码有效。我从官方文件中复制了这份声明https://express-validator.github.io/docs/custom-validators-sanitizers.html保存新用户时出现此错误

{"errors":[{"location":"body","param":"passwordconf","value":"password1","msg":"Cannot read property 'then' of undefined"}]}

这里少了什么？

Answer 1

这是一个已知的错误，将在下一个版本中修复(当前版本为v.2.0(。
不返回任何内容的自定义验证器会因该错误而失败。

要解决此问题，您可以简单地从验证器返回true：

check('passwordconf').custom((value , { req }) => {
if (value !== req.body.password) {
throw new Error('Password confirmation is incorrect');
}
return true;
})