[FIX] UserNovel 중복 등록 방지

src/main/java/org/websoso/WSSServer/domain/UserNovel.java

@@ -13,6 +13,8 @@
 import jakarta.persistence.JoinColumn;
 import jakarta.persistence.ManyToOne;
 import jakarta.persistence.OneToMany;
+import jakarta.persistence.Table;
+import jakarta.persistence.UniqueConstraint;
 import java.time.LocalDate;
 import java.util.ArrayList;
 import java.util.List;
@@ -27,6 +29,9 @@
 @Getter
 @DynamicInsert
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Table(name = "user_novel", uniqueConstraints = {
+        @UniqueConstraint(columnNames = {"user_id", "novel_id"})
+})
 public class UserNovel extends BaseEntity {
 
     @Id

src/main/java/org/websoso/WSSServer/service/NovelService.java

@@ -18,6 +18,7 @@
 import java.util.Set;
 import java.util.stream.Collectors;
 import lombok.RequiredArgsConstructor;
+import org.springframework.dao.DataIntegrityViolationException;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.PageRequest;
 import org.springframework.stereotype.Service;
@@ -137,7 +138,11 @@ public void registerAsInterest(User user, Long novelId) {
         }
 
         if (userNovel == null) {
-            userNovel = userNovelService.createUserNovelByInterest(user, novel);
+            try {
+                userNovel = userNovelService.createUserNovelByInterest(user, novel);
+            } catch (DataIntegrityViolationException e) {
+                userNovel = userNovelService.getUserNovelOrException(user, novelId);
+            }
         }
 
         userNovel.setIsInterest(true);

src/main/java/org/websoso/WSSServer/service/UserNovelService.java

@@ -16,6 +16,7 @@
 import java.util.Set;
 import java.util.stream.Collectors;
 import lombok.RequiredArgsConstructor;
+import org.springframework.dao.DataIntegrityViolationException;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import org.websoso.WSSServer.domain.AttractivePoint;
@@ -89,20 +90,20 @@ public void createEvaluation(User user, UserNovelCreateRequest request) {
         Novel novel = novelRepository.findById(request.novelId())
                 .orElseThrow(() -> new CustomNovelException(NOVEL_NOT_FOUND, "novel with the given id is not found"));
 
-        if (getUserNovelOrNull(user, novel) != null) {
+        try {
+            UserNovel userNovel = userNovelRepository.save(UserNovel.create(
+                    request.status(),
+                    request.userNovelRating(),
+                    request.startDate(),
+                    request.endDate(),
+                    user,
+                    novel));
+
+            createUserNovelAttractivePoints(userNovel, request.attractivePoints());
+            createNovelKeywords(userNovel, request.keywordIds());
+        } catch (DataIntegrityViolationException e) {
             throw new CustomUserNovelException(USER_NOVEL_ALREADY_EXISTS, "this novel is already registered");
         }
-
-        UserNovel userNovel = userNovelRepository.save(UserNovel.create(
-                request.status(),
-                request.userNovelRating(),
-                request.startDate(),
-                request.endDate(),
-                user,
-                novel));
-
-        createUserNovelAttractivePoints(userNovel, request.attractivePoints());
-        createNovelKeywords(userNovel, request.keywordIds());
     }
 
     public void updateEvaluation(User user, Long novelId, UserNovelUpdateRequest request) {