feat: 게시글 제목 검색 기능 구현

src/main/java/com/feesh/domain/main/controller/MainController.java

@@ -49,7 +49,8 @@ public PostListResponse getPopularPosts(
     public PostSearchResponse search(
             @RequestParam String keyword,
             @PageableDefault Pageable pageable) {
-        return mainService.searchPosts(keyword, pageable);
+        Long userId = SecurityUtil.getCurrentUserIdOrNull();
+        return mainService.searchPosts(keyword, pageable, userId);
     }
 
     @GetMapping("/categories")

src/main/java/com/feesh/domain/main/service/MainService.java

@@ -58,33 +58,11 @@ public List<CategoryResponse> getCategories() {
                 .toList();
     }
 
-    public PostSearchResponse searchPosts(String keyword, Pageable pageable) {
-        Page<Post> posts = postRepository.findByTitleContaining(keyword, pageable);
-
-        List<PostSummaryResponse> summaries = posts.getContent().stream()
-                .map(post -> PostSummaryResponse.builder()
-                        .id(post.getId())
-                        .title(post.getTitle())
-                        .build())
-                .toList();
+    public PostSearchResponse searchPosts(String keyword, Pageable pageable, Long userId) {
+        Page<PostSummaryResponse> posts = postRepository.searchPostSummariesByTitle(keyword, pageable, userId);
 
         return PostSearchResponse.builder()
-                .posts(summaries)
-                .totalPages(posts.getTotalPages())
-                .totalElements(posts.getTotalElements())
-                .build();
-    }
-
-    private PostListResponse toPostListResponse(Page<Post> posts) {
-        List<PostSummaryResponse> summaries = posts.getContent().stream()
-                .map(post -> PostSummaryResponse.builder()
-                        .id(post.getId())
-                        .title(post.getTitle())
-                        .build())
-                .toList();
-
-        return PostListResponse.builder()
-                .posts(summaries)
+                .posts(posts.getContent())
                 .totalPages(posts.getTotalPages())
                 .totalElements(posts.getTotalElements())
                 .build();

src/main/java/com/feesh/domain/post/repository/PostRepository.java

@@ -11,12 +11,6 @@
 
 public interface PostRepository extends JpaRepository<Post, Long> {
 
-    Page<Post> findAllByOrderByCreatedAtDesc(Pageable pageable);
-
-    Page<Post> findAllByOrderByLikeCountDesc(Pageable pageable);
-
-    Page<Post> findByTitleContaining(String keyword, Pageable pageable);
-
     Page<Post> findByAuthorId(Long authorId, Pageable pageable);
 
     void deleteAllByAuthor_Id(Long authorId);
@@ -87,4 +81,28 @@ Page<PostSummaryResponse> findPopularPostSummaries(
             @Param("category") Category category,
             Pageable pageable,
             @Param("userId") Long userId);
-}
+    @Query(value = """
+    SELECT new com.feesh.domain.main.dto.PostSummaryResponse(
+        p.id, p.title, p.category, p.price, p.content,
+        author.nickname, author.profileImageUrl, p.likeCount,
+        (SELECT COUNT(c) FROM Comment c WHERE c.post = p AND c.isDeleted = false),
+        p.createdAt,
+        CASE WHEN EXISTS (
+             SELECT 1 FROM PostLike pl WHERE pl.post = p AND pl.user.id = :userId
+        ) THEN true ELSE false END,
+        p.viewCount
+    )
+    FROM Post p
+    JOIN p.author author
+    WHERE p.title LIKE CONCAT('%', :keyword, '%')
+    ORDER BY p.createdAt DESC
+    """,
+            countQuery = """
+        SELECT COUNT(p) FROM Post p
+        WHERE p.title LIKE CONCAT('%', :keyword, '%')
+        """)
+    Page<PostSummaryResponse> searchPostSummariesByTitle(
+            @Param("keyword") String keyword,
+            Pageable pageable,
+            @Param("userId") Long userId);
+}