LOGIN AFTER SIGNUP

 WHENEVER A USER SIGN'S UP, HE SHOULD BE AUTOMATICALLY LOGGED IN.

PASSPORT HAS INBULIT LOGIN() METHOD THAT SOLVES THIS TASK.

router.post(

  "/signup",

  wrapAsync(async (req, res) => {

    try {

      let { username, email, password } = req.body;

      const newuser = new User({ username, email });

      const RegUser = await User.register(newuser, password);

      console.log(RegUser);

      req.login(RegUser, function (err) {

        if (err) {

          return next(err);

        }

        req.flash("success", "Welcome to WanderLust!");

        res.redirect("/listings");

      });

    } catch (e) {

      req.flash("error", e.message);

      res.redirect("/signup");

    }

  })

);