[REST API] 18. Blog V3 : Love

1. DTO Setting

• LoveRequest

@Data
    public static class SaveDTO {
        @NotNull(message = "board의 id가 전달되어야 합니다")
        private Integer boardId;

        public Love toEntity(Integer sessionUserId) {
            return Love.builder()
                    .board(Board.builder().id(boardId).build())
                    .user(User.builder().id(sessionUserId).build())
                    .build();
        }
    }

• ReplyResponse

@Data
    public static class SaveDTO {
        private Integer loveId;
        private Integer loveCount;

        public SaveDTO(Integer loveId, Integer loveCount) {
            this.loveId = loveId;
            this.loveCount = loveCount;
        }
    }

    @Data
    public static class DeleteDTO {
        private Integer loveCount;

        public DeleteDTO(Integer loveCount) {
            this.loveCount = loveCount;
        }
    }

2. 좋아요 추가

• LoveController
• Blogv2와 구조는 동일, ResponseEntity로 변경

@PostMapping("/s/api/love")
    public ResponseEntity<?> saveLove(@RequestBody @Valid LoveRequest.SaveDTO reqDTO, Errors errors) {
        User sessionUser = (User) session.getAttribute("sessionUser");
        LoveResponse.SaveDTO respDTO = loveService.좋아요(reqDTO, sessionUser.getId());

        return Resp.ok(respDTO);
    }

• LoveService

@Transactional
    public LoveResponse.SaveDTO 좋아요(LoveRequest.SaveDTO reqDTO, Integer sessionUserId) {
        Love lovePS = loveRepository.save(reqDTO.toEntity(sessionUserId));
        Long loveCount = loveRepository.findByBoardId(reqDTO.getBoardId());
        return new LoveResponse.SaveDTO(lovePS.getId(), loveCount.intValue());
    }

Result

3. 좋아요 취소

• LoveController
• Blogv2와 구조는 동일, ResponseEntity로 변경

@DeleteMapping("/s/api/love/{id}")
    public ResponseEntity<?> deleteLove(@PathVariable("id") Integer id) {
        User sessionUser = (User) session.getAttribute("sessionUser");
        LoveResponse.DeleteDTO respDTO = loveService.좋아요취소(id, sessionUser.getId());

        return Resp.ok(respDTO);
    }

• LoveService

@Transactional
    public LoveResponse.DeleteDTO 좋아요취소(Integer id, Integer sessionUserId) {
        Love lovePS = loveRepository.findById(id)
                .orElseThrow(() -> new ExceptionApi404("자원을 찾을 수 없습니다"));
 
        if (!lovePS.getUser().getId().equals(sessionUserId)) {
            throw new ExceptionApi403("권한이 없습니다");
        }

        Integer boardId = lovePS.getBoard().getId();

        loveRepository.deleteById(id);

        Long loveCount = loveRepository.findByBoardId(boardId);

        return new LoveResponse.DeleteDTO(loveCount.intValue());
    }

Result