[feat] 여행 후기(TripRecord)의 평점(averageRating) 계산 로직 추가

src/main/java/com/haejwo/tripcometrue/domain/review/triprecordreview/service/TripRecordReviewService.java

@@ -66,6 +66,7 @@ public EvaluateTripRecordReviewResponseDto saveRatingScore(
 
         isAlreadyTripRecordReviewExists(loginMember, tripRecord);
 
+        tripRecord.calculateAverageRating(requestDto.ratingScore());
         return EvaluateTripRecordReviewResponseDto
                 .fromEntity(tripRecordReviewRepository.save(requestDto.toEntity(loginMember, tripRecord)));
     }
@@ -103,6 +104,9 @@ public void modifyTripRecordReview(
         validateRightMemberAccess(loginMember, tripRecordReview);
         isContentAlreadyRegistered(tripRecordReview);
 
+        TripRecord tripRecord = tripRecordReview.getTripRecord();
+        tripRecord.updateAverageRating(requestDto.ratingScore(), tripRecordReview);
+
         tripRecordReview.update(requestDto, loginMember);
     }
 

src/main/java/com/haejwo/tripcometrue/domain/triprecord/entity/TripRecord.java

@@ -1,6 +1,7 @@
 package com.haejwo.tripcometrue.domain.triprecord.entity;
 
 import com.haejwo.tripcometrue.domain.member.entity.Member;
+import com.haejwo.tripcometrue.domain.review.triprecordreview.entity.TripRecordReview;
 import com.haejwo.tripcometrue.domain.store.entity.TripRecordStore;
 import com.haejwo.tripcometrue.domain.triprecord.dto.request.TripRecordRequestDto;
 import com.haejwo.tripcometrue.domain.triprecord.entity.type.ExpenseRangeType;
@@ -61,14 +62,16 @@ public class TripRecord extends BaseTimeEntity {
     @OneToMany(mappedBy = "tripRecord", fetch = FetchType.LAZY, cascade = CascadeType.REMOVE)
     private List<TripRecordStore> tripRecordStores = new ArrayList<>();
 
+    @OneToMany(mappedBy = "tripRecord", cascade = CascadeType.REMOVE)
+    private List<TripRecordReview> tripRecordReviews = new ArrayList<>();
 
     @Builder
     private TripRecord(Long id, String title, String content, ExpenseRangeType expenseRangeType,
-        String countries, LocalDate tripStartDay, LocalDate tripEndDay, Integer totalDays,
-        Double averageRating, Integer viewCount, Integer storeCount, Integer reviewCount,
-        Integer commentCount, List<TripRecordSchedule> tripRecordSchedules,
-        List<TripRecordTag> tripRecordTags, List<TripRecordImage> tripRecordImages,
-        List<TripRecordStore> tripRecordStores, Member member) {
+                       String countries, LocalDate tripStartDay, LocalDate tripEndDay, Integer totalDays,
+                       Double averageRating, Integer viewCount, Integer storeCount, Integer reviewCount,
+                       Integer commentCount, List<TripRecordSchedule> tripRecordSchedules,
+                       List<TripRecordTag> tripRecordTags, List<TripRecordImage> tripRecordImages,
+                       List<TripRecordStore> tripRecordStores, Member member) {
         this.id = id;
         this.title = title;
         this.content = content;
@@ -95,48 +98,68 @@ public void update(TripRecordRequestDto requestDto) {
         this.expenseRangeType = requestDto.expenseRangeType();
         this.tripStartDay = requestDto.tripStartDay();
         this.tripEndDay = requestDto.tripEndDay();
-        this.totalDays = (int)ChronoUnit.DAYS.between(this.tripStartDay, this.tripEndDay)+1;
+        this.totalDays = (int) ChronoUnit.DAYS.between(this.tripStartDay, this.tripEndDay) + 1;
         this.countries = requestDto.countries();
     }
 
     public void incrementViewCount() {
-        if(this.viewCount == null) {
+        if (this.viewCount == null) {
             this.viewCount = 1;
         } else {
             this.viewCount++;
         }
     }
 
     public void incrementStoreCount() {
-        if(this.storeCount == null) {
+        if (this.storeCount == null) {
             this.storeCount = 1;
         } else {
             this.storeCount++;
         }
     }
 
     public void decrementStoreCount() {
-        if(this.storeCount > 0) {
+        if (this.storeCount > 0) {
             this.storeCount--;
         }
     }
 
     public void incrementReviewCount() {
-        if(this.reviewCount == null) {
+        if (this.reviewCount == null) {
             this.reviewCount = 1;
         } else {
             this.reviewCount++;
         }
     }
 
     public void incrementCommentCount() {
-        if(this.commentCount == null) {
+        if (this.commentCount == null) {
             this.commentCount = 1;
         } else {
             this.commentCount++;
         }
     }
 
+    public void calculateAverageRating(double ratingScore) {
+        if (tripRecordReviews.isEmpty()) {
+            averageRating = ratingScore;
+        } else {
+            double totalRating = averageRating * tripRecordReviews.size();
+            totalRating += ratingScore;
+            averageRating = totalRating / (tripRecordReviews.size() + 1);
+        }
+    }
+
+    public void updateAverageRating(double newRatingScore, TripRecordReview tripRecordReview) {
+        double totalRating = averageRating * tripRecordReviews.size();
+        double previousRatingScore = tripRecordReview.getRatingScore();
+
+        totalRating -= previousRatingScore;
+        totalRating += newRatingScore;
+
+        averageRating = totalRating / tripRecordReviews.size();
+    }
+
     public void decreaseCommentCount(int count) {
         this.commentCount -= count;
     }
@@ -159,6 +182,6 @@ private int calculateTotalDays() {
         if (this.tripStartDay == null || this.tripEndDay == null) {
             return 0;
         }
-        return (int) ChronoUnit.DAYS.between(this.tripStartDay, this.tripEndDay)+1;
+        return (int) ChronoUnit.DAYS.between(this.tripStartDay, this.tripEndDay) + 1;
     }
 }