feat(community): CommunityBoardRepository에 existsById 추가 및 검증 테스트 추가

Author: ayoung-dev

src/main/java/com/somemore/community/repository/board/CommunityBoardRepository.java

@@ -12,5 +12,9 @@ public interface CommunityBoardRepository {
     Optional<CommunityBoard> findById(Long id);
     List<CommunityBoardView> getCommunityBoards();
     List<CommunityBoardView> findByWriterId(UUID writerId);
+    boolean existsById(Long id);
+    default boolean doesNotExistById(Long id) {
+        return !existsById(id);
+    }
     void deleteAllInBatch();
 }

src/main/java/com/somemore/community/repository/board/CommunityBoardRepositoryImpl.java

@@ -52,6 +52,18 @@ public List<CommunityBoardView> findByWriterId(UUID writerId) {
                 .fetch();
     }
 
+    @Override
+    public boolean existsById(Long id) {
+        QCommunityBoard communityBoard = QCommunityBoard.communityBoard;
+
+        return queryFactory
+                .selectOne()
+                .from(communityBoard)
+                .where(communityBoard.id.eq(id)
+                        .and(communityBoard.deleted.eq(false)))
+                .fetchFirst() != null;
+    }
+
     private JPAQuery<CommunityBoardView> getCommunityBoardsQuery() {
         QCommunityBoard communityBoard = QCommunityBoard.communityBoard;
         QVolunteer volunteer = QVolunteer.volunteer;

src/test/java/com/somemore/community/repository/CommunityBoardRepositoryTest.java

@@ -158,4 +158,27 @@ void getCommunityBoardsByWriterId() {
         assertThat(communityBoards.getLast().writerNickname()).isEqualTo(volunteer.getNickname());
         assertThat(communityBoards.getLast().communityBoard().getCreatedAt()).isEqualTo(communityBoard1.getCreatedAt());
     }
+
+    @DisplayName("게시글 id로 게시글이 존재하는지 확인할 수 있다.")
+    @Test
+    void existsById() {
+
+        //given
+        UUID writerId = UUID.randomUUID();
+
+        CommunityBoard communityBoard = CommunityBoard.builder()
+                .title("테스트 커뮤니티 게시글 제목")
+                .content("테스트 커뮤니티 게시글 내용")
+                .imgUrl("http://community.example.com/123")
+                .writerId(writerId)
+                .build();
+
+        CommunityBoard savedComment = communityBoardRepository.save(communityBoard);
+
+        //when
+        boolean isExist = communityBoardRepository.existsById(savedComment.getId());
+
+        //then
+        assertThat(isExist).isTrue();
+    }
 }