@Entity
@Table(name = "board")
@Getter
@NoArgsConstructor(access = AccessLevel.PROTECTED)
public class BoardEntity {

    //... 필드 및 메소드 ...

    // 팩토리 메소드 - BoardEntity 생성 로직을 캡슐화
    public static BoardEntity create(String title, String content, UserEntity writerEmail) {
        BoardEntity boardEntity = new BoardEntity();
        boardEntity.title = title;
        boardEntity.content = content;
        boardEntity.writeDatetime = LocalDateTime.now();
        boardEntity.favoriteCount = 0;
        boardEntity.commentCount = 0;
        boardEntity.viewCount = 0;
        boardEntity.writerEmail = writerEmail;
        return boardEntity;
    }
}

@Override
public ResponseEntity<? super PostBoardResponseDto> postBoard(PostBoardRequestDto dto, String email) {
  // ... 코드 생략 ...

  try {
    UserEntity writer = userRepository.findById(email)
            .orElseThrow(() -> new RuntimeException("User not found"));
    BoardEntity boardEntity = BoardEntity.create(dto.getTitle(), dto.getContent(), writer);
    boardRepository.save(boardEntity);

    // ... 코드 생략 ...

    return PostBoardResponseDto.success();
  } catch (Exception exception) {
    return exceptionHandler.handleException(exception);
  }
}