Merge pull request #119 from News-Sseuk/FIX#78

[FIX] 양방향 참조로 인한 레디스 순환참조 문제 (stackoverflow)를 DTO로 해결

src/main/java/backend/newssseuk/springbootmongodb/dto/ArticleResponseDto.java

@@ -1,6 +1,7 @@
 package backend.newssseuk.springbootmongodb.dto;
 
 import backend.newssseuk.domain.articleHashTag.ArticleHashTag;
+import backend.newssseuk.springbootmongodb.redis.ArticleHashTagDTO;
 import backend.newssseuk.springbootmongodb.redis.ArticleRedisEntity;
 import com.mongodb.lang.Nullable;
 import lombok.*;
@@ -25,7 +26,7 @@ public class ArticleResponseDto {
 
     private String category;
 
-    private List<ArticleHashTag> hashTagList;
+    private List<ArticleHashTagDTO> hashTagList;
 
     private Integer reliability;
 

src/main/java/backend/newssseuk/springbootmongodb/redis/ArticleHashTagDTO.java

@@ -0,0 +1,19 @@
+package backend.newssseuk.springbootmongodb.redis;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class ArticleHashTagDTO {
+    private Long id;
+    private Long articleId; // Article의 ID만 저장
+    private String hashTagName; // HashTag 이름만 저장
+    private LocalDateTime createdTime;
+}

src/main/java/backend/newssseuk/springbootmongodb/redis/ArticleRedisCachingService.java

@@ -9,8 +9,10 @@
 import org.springframework.transaction.annotation.Transactional;
 
 import java.time.format.DateTimeFormatter;
+import java.util.Collections;
 import java.util.NoSuchElementException;
 import java.util.Optional;
+import java.util.stream.Collectors;
 
 @Service
 @RequiredArgsConstructor
@@ -36,7 +38,16 @@ public ArticleRedisEntity cashingArticles(String id) {
                     .content(article.get().getContent())
                     .category(article.get().getCategory().getKorean())
                     .publishedDate(article.get().getPublishedDate().format(DateTimeFormatter.ofPattern("yyyy.MM.dd HH:mm")))    // yyyy.MM.dd HH:mm 형식으로 변경하기
-                    .hashTagList(jpaArticle.getArticleHashTagList())
+                    .hashTagList(Optional.ofNullable(jpaArticle.getArticleHashTagList())
+                            .orElse(Collections.emptyList())
+                            .stream()
+                            .map(articleHashTag -> ArticleHashTagDTO.builder()
+                                    .id(articleHashTag.getId())
+                                    .articleId(articleHashTag.getArticle().getId()) // Article ID만 사용
+                                    .hashTagName(articleHashTag.getHashTag().getName()) // HashTag 이름 사용
+                                    .createdTime(articleHashTag.getCreatedTime())
+                                    .build())
+                            .collect(Collectors.toList()))
                     .reliability(jpaArticle.getReliability())
                     .summary(jpaArticle.getSummary())
                     .build());

src/main/java/backend/newssseuk/springbootmongodb/redis/ArticleRedisEntity.java

@@ -12,7 +12,7 @@
 @Builder
 @Getter
 @Setter
-@ToString
+@ToString(exclude = "hashTagList")
 @AllArgsConstructor
 @NoArgsConstructor
 @RedisHash(value="article")
@@ -34,7 +34,7 @@ public class ArticleRedisEntity {
     @Indexed
     private String category;
 
-    private List<ArticleHashTag> hashTagList;
+    private List<ArticleHashTagDTO> hashTagList;
 
     private Integer reliability;