@Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        User user = (User) o;

        if (email != null ? !email.equals(user.email) : user.email != null) return false;
        if (password != null ? !password.equals(user.password) : user.password != null) return false;
        if (user_id != null ? !user_id.equals(user.user_id) : user.user_id != null) return false;

        return true;
    }