Error: Failed to serialize user into session - mysql

Question

I am using mysql with nodejs. I am getting "Error: failed to serialize user into session". When I console.log user in serializeuser function it prints "serialize [object Object]" and in "local-login" strategy it prints RowDataPacket as shown below.
RowDataPacket {
Patient_id: 2,
fname: 'xxx',
mname: 'yyy',
lname: 'zzz',
Email: 'xxx#yyy.com',
pass: '$2b$10$ycZI4SLTJEihxKDHpCXwcOhkmBiOKzmMqFyuEOgXa0KuXYupgaMeG',
Contact: '090078601',
Gender: 'Male',
dateofbirth: 1111-01-13T19:31:48.000Z,
Blood_group: null
}
// used to serialize the user for the session
passport.serializeUser(function(user, done) {
console.log(`serialize ${user}`)
done(null, user.patient_id)
})
// used to deserialize the user
passport.deserializeUser(function(id, done) {
// connection.connect()
connection.query("SELECT * FROM PATIENT WHERE PATIENT_ID = ? ",[id], function(err, rows){
done(err, rows[0])
})
// connection.end()
})
passport.use('local-login', new LocalStrategy({
// by default, local strategy uses username and password, we will override with email
usernameField : 'email',
passwordField : 'password',
passReqToCallback : true // allows us to pass back the entire request to the callback
},
function(req, email, password, done) { // callback with email and password from our form
// connection.connect()
connection.query("SELECT * FROM PATIENT WHERE EMAIL = ?",[email],function(err,rows){
if (err)
return done(err)
if (!rows.length) {
return done(null, false, req.flash('error', 'No user found.')) // req.flash is the way to set flashdata using connect-flash
}
bcrypt.compare(password, rows[0].pass, function(err, result) {
if(!result)
{
return done(null, false, req.flash('error', 'Oops! Wrong password.'))
}
// console.log(rows[0])
});
return done(null, rows[0])
})
// connection.end()
}
))
my post login look like this
router.post('/patient/login', ensureGuest, passport.authenticate('local-login', {
successRedirect : '/home', // redirect to the secure profile section
failureRedirect : 'login', // redirect back to the signup page if there is an error
failureFlash : true // allow flash messages
})
);
don't suggest to use session:false while authenticating in post method

Answer 1

The type of object being returned by the sql query was causing the problem, serialize and deserialize accepts json object so I just added stringifyObjects option in my connection configs so that sql query returns json objects and not the default type of object which it usually returns.
module.exports = {
'connection': {
'host': 'localhost',
'user': 'root',
'password': 'fast',
'database': 'hms',
'stringifyObjects': 'Stringify'
}
};