Node.js Insert comments into MySQL second table with foreign key -

Question

I have two tables in my database:

Users:

and

comments:

Users authenticated with Passport.js can enter rooms. When these logged in users sent a message, I need the message to go to the comments table, which has a foreign key from the user's table.

I'm not sure if I'm using the right solution. But here's what I tried to use, I know it's wrong, but how would I alter to get the comments of logged in users to my comments table:

router.post("/superhero-movies", function(req, res) {
  const { comments } = req.body;
  const sqlDatabase = require('../db.js');

  sqlDatabase.query('INSERT INTO comments (comments) VALUES (?)', [comments], function(error, results, fields) {
      if (error) throw error;
      console.log(results);
      return res.render('superhero-movies')

  })
})

router.get("/superhero-movies", authenticationMiddleware(), function(req, res) {
  res.render('superhero-movies');


router.post("/login",
  passport.authenticate('local', {
      successRedirect: '/',
      failureRedirect: '/login',
      // failureFlash: true,

  }));
passport.use(new LocalStrategy({
      usernameField: 'email',
      passwordField: 'password',
      passReqToCallback: true,
  },
  function(req, email, password, done) {
      console.log(email, password, done);
      const sqlDatabase = require('../db.js');




      sqlDatabase.query('SELECT * FROM users WHERE email = ?', [email], (err, results, fields, res) => {
          if (err)
              return done(err);
          console.log(err, fields, results);




          if (results.length === 0) {
              done(null, false, { message: 'Check email and password again.' });
          } else {

              const hash = results[0].
              password.toString();

              const user_id = results[0].id;


              bcrypt.compare(password, hash, function(err, response) {
                  console.log(user_id);
                  if (response === true) {
                      return done(null, user_id);
                  } else {
                      console.log(user_id);
                      console.log(err);
                      return done(null, false, { message: 'This is a test notification.' });

                  }
              })
          }

      })

  }));

passport.serializeUser(function(user_id, done) {
  console.log(user_id);
  done(null, user_id);
  console.log(done);
  console.log('serialized', user_id);

});
passport.deserializeUser(function(user_id, done) {
  done(null, user_id);
  console.log(done);
  console.log('deserialized', user_id);

});

  sqlMessage: 'Cannot add or update a child row: a foreign key constraint fails (`app_users`.`comments`, CONSTRAINT `comments_ibfk_1` FOREIGN KEY (`comments_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE)',

Not sure if I'm supposed to use a split query with select and insert, or if I'm going about this whole thing the wrong way.

Excuse the mishandling after the insert statement. Will fix it.

Answer 1

I know I posted this question a while back, but I just want to post the answer in case someone might need it in the future.

router.post("/superhero", function(req, res) {

    const user = req.user;
    const comments = req.body.comments;

    sqlDatabase.query("INSERT INTO comments (user_id, comments) VALUES (?, ?)", [user, comments],
        function(error, results, fields) {
            if (error) throw error;
            console.log(results);
            console.log(comments);
            console.log(error)

        });
})

That req.user is from passport authentication.