[Refactor] Comment 조회 시 이미지가 없다면 null 반환 하도록 수정

src/main/java/com/jisungin/application/comment/CommentFindAllResponse.java

@@ -62,7 +62,7 @@ private static List<String> extractCommentImages(List<CommentImage> commentImage
         return Optional.ofNullable(commentImages)
                 .orElseGet(ArrayList::new)
                 .stream()
-                .map(CommentImage::getImageUrl)
+                .map(commentImage -> commentImage != null ? commentImage.getImageUrl() : null)
                 .toList();
     }
 

src/main/java/com/jisungin/application/comment/CommentService.java

@@ -63,8 +63,6 @@ public CommentResponse writeComment(CommentCreateServiceRequest request, Long ta
             request.getImageUrls().stream()
                     .map(url -> CommentImage.createImages(comment, url))
                     .forEach(commentImageRepository::save);
-        } else {
-            commentImageRepository.save(CommentImage.createImages(comment, ""));
         }
 
         List<String> imageUrls = commentImageRepository.findByCommentIdWithImageUrl(comment.getId());
@@ -83,7 +81,8 @@ public PageResponse<CommentFindAllResponse> findAllComments(Long talkRoomId) {
 
         Long totalCount = commentRepository.commentTotalCount(talkRoom.getId());
 
-        return PageResponse.of(findComment.size(), totalCount, CommentFindAllResponse.toList(findComment, commentImages));
+        return PageResponse.of(findComment.size(), totalCount,
+                CommentFindAllResponse.toList(findComment, commentImages));
     }
 
     @Transactional

src/test/java/com/jisungin/application/comment/CommentServiceTest.java

@@ -117,7 +117,7 @@ void writeComment() {
         // then
         assertThat(response)
                 .extracting("content", "userName", "imageUrls")
-                .contains("의견 남기기", "[email protected]", List.of(""));
+                .contains("의견 남기기", "[email protected]", List.of());
     }
 
     @Test
@@ -580,6 +580,49 @@ void findAllCommentsWithImage() {
                 );
     }
 
+    @Test
+    @DisplayName("의견을 조회할 때 이미지도 같이 조회 된다.(2)")
+    void findAllCommentsWithImage2() {
+        // given
+        User user = userRepository.save(createUser());
+        Book book = bookRepository.save(createBook());
+        TalkRoom talkRoom = talkRoomRepository.save(createTalkRoom(book, user));
+
+        createTalkRoomRole(talkRoom);
+
+        List<Comment> comments = IntStream.range(1, 6)
+                .mapToObj(i -> Comment.builder()
+                        .talkRoom(talkRoom)
+                        .user(user)
+                        .content("의견 " + i)
+                        .registeredDateTime(LocalDateTime.now())
+                        .build())
+                .toList();
+
+        for (int i = 0; i < 5; i++) {
+            commentRepository.save(comments.get(i));
+        }
+
+        CommentImage images = CommentImage.createImages(comments.get(0), "이미지 1");
+
+        commentImageRepository.save(images);
+
+        // when
+        PageResponse<CommentFindAllResponse> result = commentService.findAllComments(talkRoom.getId());
+
+        // then
+        assertThat(result.getTotalCount()).isEqualTo(5L);
+        assertThat(result.getQueryResponse()).hasSize(5)
+                .extracting("content", "commentImages")
+                .containsExactly(
+                        tuple("의견 5", List.of()),
+                        tuple("의견 4", List.of()),
+                        tuple("의견 3", List.of()),
+                        tuple("의견 2", List.of()),
+                        tuple("의견 1", List.of("이미지 1"))
+                );
+    }
+
     private static Comment createComment(User user, TalkRoom talkRoom) {
         return Comment.builder()
                 .content("의견")