BE-FEAT-게시판-하위-목록-및-삭제-기능-추가

backend/src/main/java/org/sejongisc/backend/board/controller/BoardController.java

@@ -160,6 +160,34 @@ public ResponseEntity<List<BoardResponse>> getParentBoards(
     return ResponseEntity.ok(postService.getParentBoards());
   }
 
+
+  // 게시판 생성
+  @Operation(
+          summary = "하위 게시판 목록 조회",
+          description = "하위 게시판 목록을 조회합니다."
+  )
+  @GetMapping("/childs")
+  public ResponseEntity<List<BoardResponse>> getChildBoards(
+          @AuthenticationPrincipal CustomUserDetails customUserDetails) {
+    return ResponseEntity.ok(postService.getChildBoards());
+  }
+
+  // 게시글 삭제
+  @Operation(
+          summary = "게시판 삭제",
+          description = "게시판 ID를 통해 게시판을 삭제합니다."
+                  + "회장만 삭제할 수 있습니다."
+                  + "관련 첨부파일 및 댓글 등도 함께 삭제됩니다."
+  )
+  @DeleteMapping("/{boardId}")
+  public ResponseEntity<?> deleteBoard(
+          @PathVariable UUID boardId,
+          @AuthenticationPrincipal CustomUserDetails customUserDetails) {
+    UUID userId = customUserDetails.getUserId();
+    postService.deleteBoard(boardId, userId);
+    return ResponseEntity.ok("게시판 삭제가 완료되었습니다.");
+  }
+
   // 좋아요 토글
   @Operation(
       summary = "좋아요 등록 및 취소",
@@ -236,4 +264,7 @@ public void deleteComment(
     UUID userId = customUserDetails.getUserId();
     postInteractionService.deleteComment(commentId, userId);
   }
+
+
+
 }

backend/src/main/java/org/sejongisc/backend/board/repository/BoardRepository.java

@@ -8,4 +8,7 @@
 public interface BoardRepository extends JpaRepository<Board, UUID> {
 
   List<Board> findAllByParentBoardIsNull();
+  List<Board> findAllByParentBoardIsNotNull();
+  List<Board> findAllByParentBoard_BoardId(UUID parentBoardId);
+
 }

backend/src/main/java/org/sejongisc/backend/board/repository/PostRepository.java

@@ -1,8 +1,10 @@
 package org.sejongisc.backend.board.repository;
 
+import java.util.List;
 import java.util.UUID;
 import org.sejongisc.backend.board.entity.Board;
 import org.sejongisc.backend.board.entity.Post;
+import org.sejongisc.backend.board.repository.projection.PostIdUserIdProjection;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.JpaRepository;
@@ -23,4 +25,11 @@ Page<Post> searchByBoardAndKeyword(
       @Param("board") Board board,
       @Param("keyword") String keyword,
       Pageable pageable);
+
+  @Query("""
+           select p.postId as postId, p.user.userId as userId
+           from Post p
+           where p.board.boardId = :boardId
+           """)
+  List<PostIdUserIdProjection> findPostIdAndUserIdByBoardId(@Param("boardId") UUID boardId);
 }

backend/src/main/java/org/sejongisc/backend/board/repository/projection/PostIdUserIdProjection.java

@@ -0,0 +1,8 @@
+package org.sejongisc.backend.board.repository.projection;
+
+import java.util.UUID;
+
+public interface PostIdUserIdProjection {
+    UUID getPostId();
+    UUID getUserId();
+}

backend/src/main/java/org/sejongisc/backend/board/service/PostService.java

@@ -33,4 +33,7 @@ public interface PostService {
 
   // 부모 게시판 목록 조회
   List<BoardResponse> getParentBoards();
+  // 하위 게시판 목록 조회
+  List<BoardResponse> getChildBoards();
+  void deleteBoard(UUID boardId, UUID boardUserId);
 }

backend/src/main/java/org/sejongisc/backend/board/service/PostServiceImpl.java

@@ -1,7 +1,11 @@
 package org.sejongisc.backend.board.service;
 
 import java.util.List;
+import java.util.Map;
 import java.util.UUID;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.sejongisc.backend.board.dto.BoardRequest;
@@ -20,10 +24,12 @@
 import org.sejongisc.backend.board.repository.PostBookmarkRepository;
 import org.sejongisc.backend.board.repository.PostLikeRepository;
 import org.sejongisc.backend.board.repository.PostRepository;
+import org.sejongisc.backend.board.repository.projection.PostIdUserIdProjection;
 import org.sejongisc.backend.common.exception.CustomException;
 import org.sejongisc.backend.common.exception.ErrorCode;
 import org.sejongisc.backend.user.dao.UserRepository;
 import org.sejongisc.backend.user.dto.UserInfoResponse;
+import org.sejongisc.backend.user.entity.Role;
 import org.sejongisc.backend.user.entity.User;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.PageRequest;
@@ -169,6 +175,28 @@ public void deletePost(UUID postId, UUID userId) {
     postRepository.delete(post);
   }
 
+  @Transactional
+  public void deleteBoard(UUID boardId, UUID boardUserId) {
+    User user = userRepository.findById(boardUserId).orElseThrow(() -> new CustomException(ErrorCode.USER_NOT_FOUND));
+    if(!user.getRole().equals(Role.PRESIDENT)){
+      throw new CustomException(ErrorCode.INVALID_BOARD_OWNER);
+    }
+    //상위 게시판이면 하위 게시판 목록을 조회
+    // 1. 부모 + 자식 boardId 목록 만들기
+    List<UUID> targetBoardIds = Stream.concat(
+            Stream.of(boardId), // 자신 포함
+            boardRepository.findAllByParentBoard_BoardId(boardId).stream()
+                    .map(Board::getBoardId)
+    ).toList();
+
+    // 2. 각 boardId마다 postId/userId 조회해서 삭제
+    targetBoardIds.stream()
+            .flatMap(id -> postRepository.findPostIdAndUserIdByBoardId(id).stream())
+            .forEach(row -> deletePost(row.getPostId(), row.getUserId()));
+    targetBoardIds.forEach(boardRepository::deleteById);
+    return;
+  }
+
   // 게시물 조회 (해당 게시판의 게시물)
   @Override
   @Transactional(readOnly = true)
@@ -307,6 +335,16 @@ public List<BoardResponse> getParentBoards() {
         .toList();
   }
 
+  // 하위 게시판 조회
+  @Transactional(readOnly = true)
+  public List<BoardResponse> getChildBoards() {
+    List<Board> childBoards = boardRepository.findAllByParentBoardIsNotNull();
+
+    return childBoards.stream()
+            .map(BoardResponse::from)
+            .toList();
+  }
+
   private PostResponse mapToPostResponse(Post post) {
     return PostResponse.builder()
         .postId(post.getPostId())

backend/src/main/java/org/sejongisc/backend/common/exception/ErrorCode.java

@@ -87,6 +87,8 @@ public enum ErrorCode {
 
   POST_NOT_FOUND(HttpStatus.NOT_FOUND, "해당 게시물을 찾을 수 없습니다."),
 
+  INVALID_BOARD_OWNER(HttpStatus.FORBIDDEN, "게시판 수정/삭제 권한이 없습니다."),
+
   INVALID_POST_OWNER(HttpStatus.FORBIDDEN, "게시물 수정/삭제 권한이 없습니다."),
 
   COMMENT_NOT_FOUND(HttpStatus.NOT_FOUND, "해당 댓글을 찾을 수 없습니다."),
@@ -101,6 +103,9 @@ public enum ErrorCode {
 
   INVALID_BOARD_TYPE(HttpStatus.BAD_REQUEST, "상위 게시판에는 글을 작성할 수 없습니다.");
 
+
+
+
   private final HttpStatus status;
   private final String message;