    public Rating(Surfer surfer, UserInfo userInfo){
      this.surfer = surfer;
      this.userInfos.add(userInfo);
      this.rating = 0;
      this.ratingCount = 0;
    }

    public Rating(Surfer surfer, UserInfo userInfo){
      this.surfer = surfer;
      this.rating = 0;
      this.ratingCount = 0;
    }
