[22/02/23]SpringBoot賛機能の実施

@Entity
@Getter
@Setter
@Table(name = "like_table")
public class LikeEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "like_id")
    private Long id;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "member_id")
    private MemberEntity memberEntity;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "board_id")
    private BoardEntity boardEntity;

    public static LikeEntity toLikeEntity(MemberEntity memberEntity, BoardEntity boardEntity){
        LikeEntity likeEntity = new LikeEntity();
        likeEntity.setMemberEntity(memberEntity);
        likeEntity.setBoardEntity(boardEntity);

        return likeEntity;
    }


}

<script>
    $(document).ready(function () {
        let likeVal = document.getElementById('like_check').value
        const boardId = $("#boardId").val();
        const memberId = $("#memberId").val();
        console.log(memberId);
        console.log(likeVal);
        const likeImg = document.getElementById("likeImg")

        if (likeVal > 0) {
            likeImg.src = "/assets/img/like_click.png";
        } else {
            likeImg.src = "/assets/img/like_empty.png";
        }
        // 좋아요 버튼을 클릭 시 실행되는 코드
        $("#likeImg").on("click", function () {
            $.ajax({
                url: '/board/like',
                type: 'POST',
                data: {'boardId': boardId, 'memberId': memberId},
                success: function (data) {
                    if (data == 1) {
                        $("#likeImg").attr("src", "/assets/img/like_click.png");
                        location.href="/board/"+boardId;

                    } else {
                        $("#likeImg").attr("src", "/assets/img/like_empty.png");
                        location.href="/board/"+boardId;
                    }
                }, error: function () {
                    $("#likeImg").attr("src", "/assets/img/like_click.png");
                    console.log('오타 찾으세요')
                }

            });

        });
    });
</script>

 // 상세조회
    @GetMapping("{boardId}")
    public String findById(@PathVariable("boardId") Long boardId, Model model, HttpSession session){
        BoardDetailDTO boardDetailDTO = bs.findById(boardId);
        List<CommentDetailDTO> commentList = cs.findAll(boardId);
        // memberId 세션값 가져오기
        Long memberId = (Long) session.getAttribute(LOGIN_ID);

        model.addAttribute("board",boardDetailDTO);
        model.addAttribute("commentList",commentList);

        bs.findLike(boardId,memberId);

        int like = bs.findLike(boardId,memberId);
        model.addAttribute("like",like);

        return "/board/findById";
    }
//좋아요
    @PostMapping("/like")
    public @ResponseBody int like(Long boardId, Long memberId) {
        int result = bs.saveLike(boardId,memberId);
        return result;
    }

 @Override
    public int findLike(Long boardId, Long memberId) {
        // 저장된 DTO 가 없다면 0, 있다면 1

        Optional<LikeEntity> findLike = lr.findByBoardEntity_IdAndMemberEntity_Id(boardId, memberId);


        if (findLike.isEmpty()){
            return 0;
        }else {

            return 1;
        }
    }

    @Transactional
    @Override
    public int saveLike(Long boardId, Long memberId) {
        Optional<LikeEntity> findLike = lr.findByBoardEntity_IdAndMemberEntity_Id(boardId, memberId);

        System.out.println(findLike.isEmpty());

        if (findLike.isEmpty()){
            MemberEntity memberEntity = mr.findById(memberId).get();
            BoardEntity boardEntity = br.findById(boardId).get();

            LikeEntity likeEntity = LikeEntity.toLikeEntity(memberEntity, boardEntity);
            lr.save(likeEntity);
            br.plusLike(boardId);
            return 1;
        }else {
            lr.deleteByBoardEntity_IdAndMemberEntity_Id(boardId, memberId);
            br.minusLike(boardId);
            return 0;

        }

    }

public interface LikeRepository extends JpaRepository<LikeEntity,Long> {
    Optional<LikeEntity> findByBoardEntity_IdAndMemberEntity_Id(Long boardId, Long memberId);
    void  deleteByBoardEntity_IdAndMemberEntity_Id(Long boardId, Long memberId);
}