[feature] #130 평점 계산 코드 수정 (4점 미만이면 마이너스 되도록)

kookmin-sw · May 4, 2024 · 25b63c4 · 25b63c4
1 parent f03f522
commit 25b63c4
Showing 1 changed file with 9 additions and 1 deletion.
diff --git a/backend/src/main/java/com/coffee/backend/domain/match/service/MatchService.java b/backend/src/main/java/com/coffee/backend/domain/match/service/MatchService.java
@@ -221,7 +221,15 @@ public Review saveReview(ReviewDto dto) {
 
         int numberOfReviews = reviewRepository.countByReceiverUserId(receiver.getUserId());
         double oldCoffeeBean = receiver.getCoffeeBean();
-        double newCoffeeBean = oldCoffeeBean + (dto.getRating() * 0.1) * numberOfReviews;
+
+        double baseline = 46.0;
+        double ratio = 0.1;
+        double standard = 4.0;
+
+        // 46 + (평점 합계 + (새로운 평점 - 기준 평점) * 반영 비율) / (평점 개수 + 1)
+        double newCoffeeBean =
+                baseline + ((oldCoffeeBean - baseline) * numberOfReviews + (dto.getRating() - standard) * ratio) /
+                        (numberOfReviews + 1);
 
         receiver.setCoffeeBean(newCoffeeBean);
         userRepository.save(receiver);