/** rejestracja użytkownika */
exports.addUser = (req, res, next) => {

    const body = validation(req);
    const role_id = body['role_id'];
    const last_name  = body['last_name'];
    const first_name = body['first_name'];
    const email = body['email'];
    const plain_password = body['password'];

    bcrypt.hash(plain_password, 12)
    .then( hashedPw => {
        const user = new User({
            email: email,
            password: hashedPw,
            first_name: first_name,
            last_name: last_name,
            role_id: role_id
        });
        return user.save();
        }).then(user => {
            res.status(200).json(
                {
                    status: 200,
                    message:'Utworzono użytkownika',
                    data: {
                        user_id: user.user_id,
                        email: user.email,
                        first_name: user.first_name,
                        last_name: user.last_name,
                        role_id: user.role_id,
                    }
                }
            );
        })
        .catch(
                    err => {
                        if(!err.statusCode) {
                            err.statusCode = 500;
                        }
                    next(err);
                });

        };