Using promises in mongoose for passport authentication - node.js

Question

var LocalStrategy = require('passport-local').Strategy;
var User = require('../models/user');
module.exports = function(passport){
passport.use('local-signup', new LocalStrategy({
usernameField: 'email',
passwordField: 'password',
passReqToCallback: true
},
function(req, email, password, done){
User.findOne({'local.username': email}).exec()
.then(function(user) {
console.log(user);
if(user){
return done(null, false, {message: 'Username already taken!'});
}
else{
var newUser = new User();
newUser.local.username = email;
newUser.local.password = password;
return newUser.save();
}
})
.then(function(user) {
console.log('DEBUG DEBUG DEBUG');
done(null, user);
})
.catch(function(err) {
done(err);
});
}
));
passport.serializeUser(function(user, done) {
done(null, user.id);
});
passport.deserializeUser(function(userid, done) {
User.findById(userid).exec()
.then(function(user) {
done(user);
});
});
};
In my case the debug log always be printed, whether return newUser.save() is called or not.
Is it possible to make the debug log only be printed when return newUser.save() is called?
Btw I'm using passportJS for authentication things and for the promise I'm override mongoose default promise with global es6 promise.

Answer 1

You mean like this? Sorry if there are extra brackets or parenthesis. I edited in the text box. :(
User.findOne({'local.username': email}).exec()
.then(function(user) {
if(user){
return done(null, false, {message: 'Username already taken!'});
}
else{
var newUser = new User();
newUser.local.username = email;
newUser.local.password = password;
return newUser.save()
.then(function(){
console.log('DEBUG DEBUG DEBUG');
done(null, user);
})
}
})
.catch(function(err) {
done(err);
});
}
));

Answer 2

Just put your debug message in a function in newUser.save()
User.findOne({'local.username': email}).exec()
.then(function(user) {
console.log(user);
if(user){
return done(null, false, {message: 'Username already taken!'});
}
else{
var newUser = new User();
newUser.local.username = email;
newUser.local.password = password;
return newUser.save(function() {
console.log('SAVED!');
console.log('DEBUG DEBUG DEBUG');
});
}
})
.then(function(user) {
done(null, user);
})