未处理的拒绝-护照登录应用程序节点js

Question

I'm creating nodejs login app and using passport js for authentication. I use a local mysql database and use sequelize as ORM library.

In my user model, I have created to get the user by username.

module.exports.findUserByUsername = function(username, callback){
  User.findOne({ where: {username: username} }).then(function(user) {
    var userObj = user.get({plain:true});
    callback(userObj);
  })
}; 

In router file

passport.use('login', new LocalStrategy(
    function (username, password, done) {

        User.findUserByUsername(username, function (err, user) {
            if(err) {
                throw err;
            }
            console.log(user);
        })
    }
));

I'm getting an error Unhandled rejection (<{object_values...>, no stack trace)

How can I solve this issue?

Answer 1

You need to change callback calling like this :

callback(null, userObj);

In router file you throw when encounter to error. Throwing exception in async calling environment is not a good practice. Anyway you call findUserByUsername passing a callback expecting first argument is error.

In findUserByUsername you return user object in error place. So your logic in router file thinks it's an error.

For avoiding such these exceptions you need not to throwing exception, return them in callback functions.