feat: 닉네임, 카테고리 검색 필터 구현

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

@@ -47,10 +47,11 @@ public PostListResponse getPopularPosts(
 
     @GetMapping("/search")
     public PostSearchResponse search(
-            @RequestParam String keyword,
+            @RequestParam(required = false) String keyword,
+            @RequestParam(required = false) Category category,
             @PageableDefault Pageable pageable) {
         Long userId = SecurityUtil.getCurrentUserIdOrNull();
-        return mainService.searchPosts(keyword, pageable, userId);
+        return mainService.searchPosts(keyword, category, pageable, userId);
     }
 
     @GetMapping("/categories")

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

@@ -58,8 +58,8 @@ public List<CategoryResponse> getCategories() {
                 .toList();
     }
 
-    public PostSearchResponse searchPosts(String keyword, Pageable pageable, Long userId) {
-        Page<PostSummaryResponse> posts = postRepository.searchPostSummariesByTitle(keyword, pageable, userId);
+    public PostSearchResponse searchPosts(String keyword, Category category, Pageable pageable, Long userId) {
+        Page<PostSummaryResponse> posts = postRepository.searchPostSummariesByTitle(keyword, category, pageable, userId);
 
         return PostSearchResponse.builder()
                 .posts(posts.getContent())

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

@@ -81,6 +81,7 @@ 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,
@@ -94,15 +95,19 @@ CASE WHEN EXISTS (
     )
     FROM Post p
     JOIN p.author author
-    WHERE p.title LIKE CONCAT('%', :keyword, '%')
+    WHERE (:keyword IS NULL OR p.title LIKE CONCAT('%', :keyword, '%') OR author.nickname LIKE CONCAT('%', :keyword, '%'))
+    AND (:category IS NULL OR p.category = :category)
     ORDER BY p.createdAt DESC
     """,
             countQuery = """
-        SELECT COUNT(p) FROM Post p
-        WHERE p.title LIKE CONCAT('%', :keyword, '%')
-        """)
+            SELECT COUNT(p) FROM Post p
+            JOIN p.author author
+            WHERE (:keyword IS NULL OR p.title LIKE CONCAT('%', :keyword, '%') OR author.nickname LIKE CONCAT('%', :keyword, '%'))
+            AND (:category IS NULL OR p.category = :category)
+            """)
     Page<PostSummaryResponse> searchPostSummariesByTitle(
             @Param("keyword") String keyword,
+            @Param("category") Category category,
             Pageable pageable,
             @Param("userId") Long userId);
 }