docs: public ReservationPurchaseRecommendation withRecommendationDetails(ReservationPurchaseRecommendationDetail... recommendationDetails) {
          if (this.recommendationDetails == null) {
              setRecommendationDetails(new java.util.ArrayList<ReservationPurchaseRecommendationDetail>(recommendationDetails.length));
          }
          for (ReservationPurchaseRecommendationDetail ele : recommendationDetails) {
              this.recommendationDetails.add(ele);
          }
          return this;
      }