app.post('/',function (req, res, next) {
	var body = req.body;
	if (!body.name || !body.email || !body.password) {
    	return res.status(400).send("Missing username or email or password")
  };
	// case #1- if user was registered (socials platform) before -> just add a password;
	User.findOneAndUpdate({
		email: body.email
	}, {
		$set: {password: body.password}
	})
		.then((user) => {
			if (!user) {
				return User.create(body);
			} else {
				return Promise.resolve(user)
			}
		})
		.then((user) => {
			return res.send({ user: user })
		})
		.catch((err) => {
			if (err.name === 'ValidationError') {
				return res.status(400).send(err)
			}
			res.status(500).send(err)
		});
});