[Spring Boot] 48. 스프링부트 블로그 v2 (JPA) (18) 댓글 작성 및 삭제 2

1. 댓글 작성

1. detail.mustache

1. boardId와 content가 서버로 넘어간다.

2. textarea는 value 속성은 따로 없지만 태그 사이의 값이 value처럼 꺼내진다.

2. Reply

1. 생성자를 만들고 @Builder를 걸어서 builder를 만들어준다.
1. @Builder는 컬렉션이 있는 클래스에서는 적용이 안된다.

    @Builder
    public Reply(Integer id, String content, User user, Board board, Timestamp createdAt) {
        this.id = id;
        this.content = content;
        this.user = user;
        this.board = board;
        this.createdAt = createdAt;
    }

3. ReplyRequest.SaveDTO

public class ReplyRequest {

    @Data
    public static class SaveDTO {
        private Integer id;
        private String content;
        private Integer boardId;

        public Reply toEntity(User sessionUser, Board board) {
            return Reply.builder()
                    .content(content)
                    .user(sessionUser)
                    .board(board)
                    .build();
        }
    }
}

4. ReplyController

@PostMapping("/reply/save")
    public String saveReply(ReplyRequest.SaveDTO reqDTO) {
        User sessionUser = (User) session.getAttribute("sessionUser");
        if (sessionUser == null) throw new RuntimeException("인증이 필요합니다.");
        replyService.save(reqDTO, sessionUser);
        return "redirect:/board/" + reqDTO.getBoardId();
    }

5. ReplyService

@Transactional
    public void save(ReplyRequest.SaveDTO reqDTO, User sessionUser) {
        Board board = boardRepository.findById(reqDTO.getBoardId());
        if (board == null) throw new RuntimeException("Board not found");

        Reply reply = reqDTO.toEntity(sessionUser, board);
        replyRepository.save(reply);
    }

6. ReplyRepository

public void save(Reply reply) {
        em.persist(reply);
    }

7. 실행 결과

2. 댓글 삭제

1. detail.mustache

2. ReplyController

@PostMapping("/reply/{id}/delete")
    public String deleteReply(@PathVariable("id") int id) {
        User sessionUser = (User) session.getAttribute("sessionUser");
        if (sessionUser == null) throw new RuntimeException("인증이 필요합니다.");

        Integer boardId = replyService.delete(id);

        return "redirect:/board/" + boardId;
    }

3. ReplyService

@Transactional
    public Integer delete(Integer id, Integer sessionUserId) {
        // 댓글 존재 확인
        Reply replyPS = replyRepository.findById(id);
        if (replyPS == null) throw new RuntimeException("Reply not found");

        // 권한 체크
        if (!(replyPS.getUser().getId().equals(sessionUserId))) throw new RuntimeException("User not authorized");

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

        replyRepository.deleteById(id);

        return boardId;
    }

4. ReplyRepository

public Reply findById(int id) {
        return em.find(Reply.class, id);
    }

    public void deleteById(int id) {
        Query query = em.createQuery("delete from Reply r where r.id = :id");
        query.setParameter("id", id);
        query.executeUpdate();
    }

5. 실행 결과

6. 댓글 삭제 시 replyPS 객체

@Transactional
    public Integer delete(Integer id, Integer sessionUserId) {
        // 댓글 존재 확인
        Reply replyPS = replyRepository.findById(id);
        if (replyPS == null) throw new RuntimeException("Reply not found");

        // 권한 체크
        if (!(replyPS.getUser().getId().equals(sessionUserId))) throw new RuntimeException("User not authorized");

        Integer boardId = replyPS.getBoard().getId();
        System.out.println("삭제 전 boardId = " + boardId);

        replyRepository.deleteById(id);
        
        Integer boardId1 = replyPS.getBoard().getId();
        System.out.println("삭제 후 boardId = " + boardId1);

        return boardId;
    }

public void deleteById(Integer id) {
        em.createQuery("delete from Reply r where r.id = :id")
                .setParameter("id", id)
                .executeUpdate();
    }