[Feat] 자유게시글 상세 조회 응답에 로그인 사용자의 좋아요 여부를 추가

src/main/java/com/semosan/api/domain/community/like/repository/PostLikeRepository.java

@@ -14,6 +14,8 @@ public interface PostLikeRepository extends JpaRepository<PostLike, Long> {
 
     boolean existsByPostAndUser(Post post, User user);
 
+    boolean existsByPostIdAndUserId(Long postId, Long userId);
+
     long countByPost(Post post);
 
     Optional<PostLike> findByPostAndUser(Post post, User user);

src/main/java/com/semosan/api/domain/community/post/dto/FreePostDetailResponse.java

@@ -14,14 +14,16 @@ public record FreePostDetailResponse(
         List<PostImageResponse> images,
         Integer viewCount,
         Long likeCount,
+        boolean likedByMe,
         Long commentCount,
         LocalDateTime createdAt
 ) {
     public static FreePostDetailResponse of(
             FreePost post,
             List<PostImage> images,
             long likeCount,
-            long commentCount
+            long commentCount,
+            boolean likedByMe
     ) {
         return new FreePostDetailResponse(
                 post.getId(),
@@ -31,6 +33,7 @@ public static FreePostDetailResponse of(
                 images.stream().map(PostImageResponse::from).toList(),
                 post.getViewCount(),
                 likeCount,
+                likedByMe,
                 commentCount,
                 post.getCreatedAt()
         );

src/main/java/com/semosan/api/domain/community/post/service/FreePostService.java

@@ -55,7 +55,7 @@ public FreePostDetailResponse create(
 
         List<PostImage> images = saveImages(post, imageUrls, mainImageIndex);
 
-        return FreePostDetailResponse.of(post, images, 0L, 0L);
+        return FreePostDetailResponse.of(post, images, 0L, 0L, false);
     }
 
     public Page<FreePostListResponse> getList(Long viewerId, Pageable pageable) {
@@ -87,8 +87,9 @@ public FreePostDetailResponse getDetail(Long viewerId, Long postId) {
         List<PostImage> images = postImageRepository.findByPostOrderBySortOrderAsc(post);
         long likeCount = postLikeRepository.countByPost(post);
         long commentCount = commentRepository.countByPostAndDeletedFalse(post);
+        boolean likedByMe = postLikeRepository.existsByPostIdAndUserId(post.getId(), viewerId);
 
-        return FreePostDetailResponse.of(post, images, likeCount, commentCount);
+        return FreePostDetailResponse.of(post, images, likeCount, commentCount, likedByMe);
     }
 
     @Transactional

src/test/java/com/semosan/api/domain/community/post/service/FreePostServiceTest.java

@@ -67,8 +67,8 @@ void getListUsesViewerSpecificVisibleQuery() throws Exception {
         Page<FreePost> page = new PageImpl<>(List.of(post), PageRequest.of(0, 10), 1);
 
         when(freePostRepository.findVisibleByViewerId(1L, PageRequest.of(0, 10))).thenReturn(page);
-        when(postLikeRepository.countByPostIdsGrouped(anyList())).thenReturn(List.of(new Object[]{10L, 3L}));
-        when(commentRepository.countByPostIdsGrouped(anyList())).thenReturn(List.of(new Object[]{10L, 2L}));
+        when(postLikeRepository.countByPostIdsGrouped(anyList())).thenReturn(List.<Object[]>of(new Object[]{10L, 3L}));
+        when(commentRepository.countByPostIdsGrouped(anyList())).thenReturn(List.<Object[]>of(new Object[]{10L, 2L}));
         when(postImageRepository.findMainImagesByPostIds(anyList())).thenReturn(List.of());
         when(postImageRepository.countByPostIdsGrouped(anyList())).thenReturn(List.of());
 
@@ -78,6 +78,25 @@ void getListUsesViewerSpecificVisibleQuery() throws Exception {
         verify(freePostRepository).findVisibleByViewerId(eq(1L), eq(PageRequest.of(0, 10)));
     }
 
+    @Test
+    void getDetailReturnsLikedByMe() throws Exception {
+        User author = user(2L, "author");
+        FreePost post = freePost(10L, author, "제목", "본문");
+
+        when(freePostRepository.findById(10L)).thenReturn(Optional.of(post));
+        when(userBlockRepository.existsByBlocker_IdAndBlockedUser_Id(1L, 2L)).thenReturn(false);
+        when(postImageRepository.findByPostOrderBySortOrderAsc(post)).thenReturn(List.of());
+        when(postLikeRepository.countByPost(post)).thenReturn(3L);
+        when(commentRepository.countByPostAndDeletedFalse(post)).thenReturn(2L);
+        when(postLikeRepository.existsByPostIdAndUserId(10L, 1L)).thenReturn(true);
+
+        FreePostDetailResponse result = freePostService.getDetail(1L, 10L);
+
+        assertThat(result.likedByMe()).isTrue();
+        assertThat(result.likeCount()).isEqualTo(3L);
+        assertThat(result.commentCount()).isEqualTo(2L);
+    }
+
     @Test
     void getDetailThrowsWhenViewerBlockedAuthor() throws Exception {
         User author = user(2L, "author");