[Feat]#105 커뮤니티 응답에 작성자 프로필 이미지/캐릭터 코드 추가

src/main/java/com/redo/domain/community/converter/CommunityConverter.java

@@ -37,7 +37,9 @@ public static CommunityResponseDTO toCommunityResponse(
             Community community,
             long numComments,
             String imageUrl,
-            String writer
+            String writer,
+            String profileImageUrl,
+            String characterCode
     ) {
         return new CommunityResponseDTO(
                 community.getId(),
@@ -48,7 +50,9 @@ public static CommunityResponseDTO toCommunityResponse(
                 community.getTitle(),
                 String.valueOf(community.getCategory().getCode()),
                 toPreview(community.getContent()),
-                writer
+                writer,
+                profileImageUrl,
+                characterCode
         );
     }
 
@@ -66,12 +70,16 @@ private static String toPreview(String content) {
     public static CommunityDetailResponseDTO toCommunityDetailResponse(
             Community community,
             String writer,
+            String profileImageUrl,
+            String characterCode,
             String imageUrl
     ) {
         return new CommunityDetailResponseDTO(
                 community.getId(),
                 community.getTitle(),
                 writer,
+                profileImageUrl,
+                characterCode,
                 community.getContent(),
                 community.getCreatedAt(),
                 imageUrl
@@ -134,10 +142,17 @@ public static CommunityComment toCommunityComment(Community community, User user
                 .build();
     }
 
-    public static CommunityCommentResponseDTO toCommunityCommentResponse(CommunityComment comment, String writer) {
+    public static CommunityCommentResponseDTO toCommunityCommentResponse(
+            CommunityComment comment,
+            String writer,
+            String profileImageUrl,
+            String characterCode
+    ) {
         return new CommunityCommentResponseDTO(
                 comment.getId(),
                 writer,
+                profileImageUrl,
+                characterCode,
                 comment.getContent(),
                 comment.getCreatedAt()
         );

src/main/java/com/redo/domain/community/dto/res/CommunityCommentResponseDTO.java

@@ -5,6 +5,8 @@
 public record CommunityCommentResponseDTO(
         Long commentId,
         String writer,
+        String profileImageUrl,
+        String characterCode,
         String content,
         LocalDateTime createdAt
 ) {

src/main/java/com/redo/domain/community/dto/res/CommunityDetailResponseDTO.java

@@ -6,6 +6,8 @@ public record CommunityDetailResponseDTO(
         Long id,
         String title,
         String writer,
+        String profileImageUrl,
+        String characterCode,
         String content,
         LocalDateTime createdAt,
         String imageUrl

src/main/java/com/redo/domain/community/dto/res/CommunityResponseDTO.java

@@ -11,6 +11,8 @@ public record CommunityResponseDTO(
         String title,
         String category,
         String preview,
-        String writer
+        String writer,
+        String profileImageUrl,
+        String characterCode
 ) {
 }

src/main/java/com/redo/domain/community/repository/CommunityRepository.java

@@ -20,20 +20,26 @@ public interface CommunityRepository extends JpaRepository<Community, Long> {
 
     Optional<Community> findByIdAndDeletedAtIsNull(Long id);
 
-    // 목록 조회용: 게시글별 작성자 닉네임을 단건 쿼리 반복 없이 한 번에 조회한다.
+    // 목록 조회용: 게시글별 작성자 프로필(닉네임/프로필 이미지 키/캐릭터 코드)을 단건 쿼리 반복 없이 한 번에 조회한다.
     // 프로필이 없는 사용자도 게시글은 조회되어야 하므로 UserProfile 은 LEFT JOIN 한다.
     @Query("""
-            SELECT c.id AS communityId, p.nickname AS nickname
+            SELECT c.id AS communityId,
+                   p.nickname AS nickname,
+                   p.profileImageKey AS profileImageKey,
+                   p.characterCode AS characterCode
             FROM Community c
             LEFT JOIN UserProfile p ON p.user = c.user
             WHERE c IN :communities
             """)
     List<CommunityWriter> findWritersByCommunities(@Param("communities") List<Community> communities);
 
-    // 게시글별 작성자 닉네임 조회 결과 projection
+    // 게시글별 작성자 프로필 조회 결과 projection
+    // LEFT JOIN 이므로 프로필이 없는 작성자는 communityId 를 제외한 값이 모두 null 이다.
     interface CommunityWriter {
         Long getCommunityId();
         String getNickname();
+        String getProfileImageKey();
+        String getCharacterCode();
     }
 
     // 동시 요청에서 갱신 유실(Lost Update)이 발생하지 않도록 좋아요 수를 DB에서 원자적으로 증가시킨다.

src/main/java/com/redo/domain/community/service/CommunityService.java

@@ -70,24 +70,34 @@ public Page<CommunityResponseDTO> getCommunityPosts(Integer category, Pageable p
 
         Map<Long, Long> commentCounts = getCommentCounts(communities.getContent());
         Map<Long, String> representativeImageKeys = getRepresentativeImageKeys(communities.getContent());
-        Map<Long, String> writers = getWriters(communities.getContent());
-
-        return communities.map(community -> CommunityConverter.toCommunityResponse(
-                community,
-                commentCounts.getOrDefault(community.getId(), 0L),
-                createImageUrl(representativeImageKeys.get(community.getId())),
-                writers.get(community.getId())
-        ));
+        Map<Long, CommunityRepository.CommunityWriter> writers = getWriters(communities.getContent());
+
+        return communities.map(community -> {
+            CommunityRepository.CommunityWriter writer = writers.get(community.getId());
+
+            return CommunityConverter.toCommunityResponse(
+                    community,
+                    commentCounts.getOrDefault(community.getId(), 0L),
+                    createImageUrl(representativeImageKeys.get(community.getId())),
+                    writer == null ? null : writer.getNickname(),
+                    writer == null ? null : createImageUrl(writer.getProfileImageKey()),
+                    writer == null ? null : writer.getCharacterCode()
+            );
+        });
     }
 
     // 게시글 상세 조회 로직
     public CommunityDetailResponseDTO getCommunityPost(Long communityId) {
         Community community = communityRepository.findByIdAndDeletedAtIsNull(communityId)
                 .orElseThrow(() -> new CommunityException(CommunityErrorCode.COMMUNITY_NOT_FOUND));
 
+        UserProfile profile = getProfile(community.getUser().getId());
+
         return CommunityConverter.toCommunityDetailResponse(
                 community,
-                getNickname(community.getUser().getId()),
+                getNickname(profile),
+                getProfileImageUrl(profile),
+                getCharacterCode(profile),
                 getRepresentativeImageUrl(community)
         );
     }
@@ -107,7 +117,7 @@ public CommunityCreateResponseDTO createCommunityPost(Long userId, CommunityCrea
         // (등록 직후 즉시 조회 용도가 아니며, 조회 시점에 상세/목록 API가 Presigned URL을 새로 발급한다.)
         List<String> imageKeys = saveImages(community, request.images());
 
-        return CommunityConverter.toCommunityCreateResponse(community, imageKeys, getNickname(userId));
+        return CommunityConverter.toCommunityCreateResponse(community, imageKeys, getNickname(getProfile(userId)));
     }
 
     // 댓글 목록 조회 로직(comment ID 기준 커서 페이징, cursor/length 없으면 전체 반환)
@@ -123,10 +133,16 @@ public CommunityCommentListResponseDTO getCommunityComments(Long communityId, Lo
 
         return CommunityConverter.toCommunityCommentListResponse(
                 comments.stream()
-                        .map(comment -> CommunityConverter.toCommunityCommentResponse(
-                                comment,
-                                getNickname(comment.getUser().getId())
-                        ))
+                        .map(comment -> {
+                            UserProfile profile = getProfile(comment.getUser().getId());
+
+                            return CommunityConverter.toCommunityCommentResponse(
+                                    comment,
+                                    getNickname(profile),
+                                    getProfileImageUrl(profile),
+                                    getCharacterCode(profile)
+                            );
+                        })
                         .toList()
         );
     }
@@ -268,18 +284,17 @@ private Map<Long, Long> getCommentCounts(List<Community> communities) {
                 ));
     }
 
-    // 목록의 게시글별 작성자 닉네임을 한 번의 쿼리로 조회하는 로직
-    private Map<Long, String> getWriters(List<Community> communities) {
+    // 목록의 게시글별 작성자 프로필을 한 번의 쿼리로 조회하는 로직
+    // 프로필이 없는 작성자도 projection 자체는 반환되므로(각 필드가 null) Map 수집에서 제외하지 않는다.
+    private Map<Long, CommunityRepository.CommunityWriter> getWriters(List<Community> communities) {
         if (communities.isEmpty()) {
             return Map.of();
         }
 
         return communityRepository.findWritersByCommunities(communities).stream()
-                // 프로필이 없어 닉네임이 null 인 경우 Map 수집에서 제외한다(조회 시 null 로 응답된다).
-                .filter(writer -> writer.getNickname() != null)
                 .collect(Collectors.toMap(
                         CommunityRepository.CommunityWriter::getCommunityId,
-                        CommunityRepository.CommunityWriter::getNickname
+                        writer -> writer
                 ));
     }
 
@@ -314,10 +329,23 @@ private String createImageUrl(String imageKey) {
         return s3Service.createPresignedUrl(imageKey);
     }
 
-    private String getNickname(Long userId) {
-        return userProfileRepository.findByUserId(userId)
-                .map(UserProfile::getNickname)
-                .orElse(null);
+    // 작성자 프로필을 조회하는 로직(프로필을 아직 만들지 않은 사용자는 null 을 반환한다)
+    private UserProfile getProfile(Long userId) {
+        return userProfileRepository.findByUserId(userId).orElse(null);
+    }
+
+    private String getNickname(UserProfile profile) {
+        return profile == null ? null : profile.getNickname();
+    }
+
+    // 작성자 프로필 이미지의 S3 객체 키를 조회용 Presigned URL로 변환하는 로직
+    // 프로필 이미지를 등록하지 않은 사용자는 null 이 되며, 이 경우 characterCode 로 대체 표시한다.
+    private String getProfileImageUrl(UserProfile profile) {
+        return profile == null ? null : createImageUrl(profile.getProfileImageKey());
+    }
+
+    private String getCharacterCode(UserProfile profile) {
+        return profile == null ? null : profile.getCharacterCode();
     }
 
     private Community getActiveCommunity(Long communityId) {