feat: 개발질문 게시판의 해시태그 기능 구현 완료

src/main/java/page/clab/api/domain/community/board/application/service/BoardRegisterService.java

@@ -55,20 +55,18 @@ public String registerBoard(BoardRequestDto requestDto) throws PermissionDeniedE
         List<UploadedFile> uploadedFiles = uploadedFileService.getUploadedFilesByUrls(requestDto.getFileUrlList());
         Board board = boardDtoMapper.fromDto(requestDto, currentMemberInfo.getMemberId(), uploadedFiles);
         board.validateAccessPermissionForCreation(currentMemberInfo);
+        board.validateBoardHashtagRegistration(requestDto.getHashtagIdList());
+
         if (board.shouldNotifyForNewBoard(currentMemberInfo)) {
             externalSendNotificationUseCase.sendNotificationToMember(currentMemberInfo.getMemberId(),
                     "[" + board.getTitle() + "] 새로운 공지사항이 등록되었습니다.");
         }
-
         BoardNotificationInfo boardInfo = BoardNotificationInfo.create(board, currentMemberInfo);
         eventPublisher.publishEvent(new NotificationEvent(this, ExecutivesAlertType.NEW_BOARD, null,
                 boardInfo));
 
         Board savedBoard = registerBoardPort.save(board);
 
-        if (!savedBoard.isDevelopmentQna() && (requestDto.getHashtagIdList() != null && !requestDto.getHashtagIdList().isEmpty())) {
-            throw new InvalidBoardCategoryHashtagException("개발질문 게시판에만 해시태그를 등록할 수 있습니다.");
-        }
         if (savedBoard.isDevelopmentQna() && requestDto.getHashtagIdList() != null) {
             registerBoardHashtagUseCase.registerBoardHashtag(boardHashtagDtoMapper.toDto(savedBoard.getId(), requestDto.getHashtagIdList()));
         }

src/main/java/page/clab/api/domain/community/board/domain/Board.java

@@ -8,6 +8,7 @@
 import lombok.NoArgsConstructor;
 import lombok.Setter;
 import page.clab.api.domain.community.board.application.dto.request.BoardUpdateRequestDto;
+import page.clab.api.domain.community.board.application.exception.InvalidBoardCategoryHashtagException;
 import page.clab.api.domain.memberManagement.member.application.dto.shared.MemberDetailedInfoDto;
 import page.clab.api.global.common.file.domain.UploadedFile;
 import page.clab.api.global.exception.PermissionDeniedException;
@@ -74,4 +75,10 @@ public void validateAccessPermissionForCreation(MemberDetailedInfoDto currentMem
             throw new PermissionDeniedException("공지사항은 관리자만 작성할 수 있습니다.");
         }
     }
+
+    public void validateBoardHashtagRegistration(List<Long> hashtagIdList) {
+        if (!isDevelopmentQna() && (hashtagIdList != null && !hashtagIdList.isEmpty())) {
+            throw new InvalidBoardCategoryHashtagException("개발질문 게시판에만 해시태그를 등록할 수 있습니다.");
+        }
+    }
 }