[REST API] 14. Blog v3 : Board

1. 글 리스트 보기

• BoardController

@GetMapping({"/", "/api/board"})
    public @ResponseBody Resp<?> list(@RequestParam(required = false, value = "page", defaultValue = "0") Integer page,
                                      @RequestParam(required = false, value = "keyword", defaultValue = "") String keyword) {
        User sessionUser = (User) session.getAttribute("sessionUser");

        BoardResponse.ListDTO respDTO;
        if (sessionUser == null) {
            respDTO = boardService.글목록보기(null, page, keyword);
        } else {
            respDTO = boardService.글목록보기(sessionUser.getId(), page, keyword);
        }

        return Resp.ok(respDTO);
    }

• BoardService

public BoardResponse.ListDTO 글목록보기(Integer userId, Integer page, String keyword) {
        if (userId == null) {
            Long totalCount = boardRepository.totalCount(keyword);
            List<Board> boards = boardRepository.findAll(page, keyword);
            return new BoardResponse.ListDTO(boards, page, totalCount.intValue(), keyword);
        } else {
            Long totalCount = boardRepository.totalCount(userId, keyword);
            List<Board> boards = boardRepository.findAll(userId, page, keyword);
            return new BoardResponse.ListDTO(boards, page, totalCount.intValue(), keyword);
        }
    }

2. 글 상세보기

• BoardController

@GetMapping("/api/board/{id}/detail")
    public @ResponseBody Resp<?> getBoardDetail(@PathVariable("id") Integer id) {
        User sessionUser = (User) session.getAttribute("sessionUser");
        Integer sessionUserId = (sessionUser == null ? null : sessionUser.getId());
        BoardResponse.DetailDTO detailDTO = boardService.글상세보기(id, sessionUserId);
        return Resp.ok(detailDTO);
    }

• BoardService

@Transactional
    public BoardResponse.DetailDTO 글상세보기(Integer id, Integer userId) {
        Board boardPS = boardRepository.findByIdJoinUserAndReplies(id)
                .orElseThrow(() -> new ExceptionApi404("자원을 찾을 수 없습니다"));

        Love love = loveRepository.findByUserIdAndBoardId(userId, id)
                .orElseThrow(() -> new ExceptionApi404("자원을 찾을 수 없습니다"));
        Long loveCount = loveRepository.findByBoardId(id);

        Integer loveId = love == null ? null : love.getId();
        Boolean isLove = love == null ? false : true;

        BoardResponse.DetailDTO detailDTO = new BoardResponse.DetailDTO(boardPS, userId, isLove, loveCount.intValue(), loveId);
        return detailDTO;
    }

3. 글 작성하기

• BoardController

@PostMapping("/s/api/board")
    public @ResponseBody Resp<?> save(@Valid @RequestBody BoardRequest.SaveDTO reqDTO, Errors errors) {
        User sessionUser = (User) session.getAttribute("sessionUser");
        BoardResponse.DTO respDTO = boardService.글쓰기(reqDTO, sessionUser);
        return Resp.ok(respDTO);
    }

• BoardService

@Transactional
    public BoardResponse.DTO 글쓰기(BoardRequest.SaveDTO reqDTO, User sessionUser) {
        Board board = reqDTO.toEntity(sessionUser);
        Board boardPS = boardRepository.save(board);
        return new BoardResponse.DTO(boardPS);
    }

4. 글 수정하기

• BoardController

@PutMapping("/s/api/board/{id}")
    public @ResponseBody Resp<?> update(@PathVariable("id") Integer id, @Valid @RequestBody BoardRequest.UpdateDTO reqDTO, Errors errors) {
        User sessionUser = (User) session.getAttribute("sessionUser");
        BoardResponse.DTO respDTO = boardService.글수정하기(reqDTO, id, sessionUser.getId());

        return Resp.ok(respDTO);
    }

• BoardService

@Transactional
    public BoardResponse.DTO 글수정하기(BoardRequest.UpdateDTO reqDTO, Integer id, Integer sessionUserId) {
        Board boardPS = boardRepository.findById(id)
                .orElseThrow(() -> new ExceptionApi404("자원을 찾을 수 없습니다"));

        if (!boardPS.getUser().getId().equals(sessionUserId)) {
            throw new ExceptionApi403("권한이 없습니다");
        }

        boardPS.update(reqDTO.getTitle(), reqDTO.getContent(), reqDTO.getIsPublic());

        return new BoardResponse.DTO(boardPS);
    } // 더티 체킹 (상태 변경해서 update)

5. 글 삭제하기

• BoardController

• BoardService

@Transactional
    public void 글삭제(Integer id, Integer sessionUserId) {
        Board boardPS = boardRepository.findById(id)
                .orElseThrow(() -> new ExceptionApi404("자원을 찾을 수 없습니다"));
        if (!boardPS.getUser().getId().equals(sessionUserId)) {
            throw new ExceptionApi403("권한이 없습니다");
        }
        boardRepository.deleteById(id);
    }