Feat: like 기능 추가

src/main/java/com/webtoonchat/toonchat/domain/board/entity/Board.java

@@ -22,10 +22,11 @@
 import lombok.Builder;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
-
+import lombok.Setter;
 
 @EntityListeners(AuditingEntityListener.class)
 @Getter
+@Setter
 @NoArgsConstructor
 @Entity
 public class Board {
@@ -61,6 +62,8 @@ public class Board {
 	@OrderBy("id asc") // 댓글 정렬
 	private List<Comment> comments;
 
+	private Long likeCount = 0L;
+
 	@Builder // 빌더 패턴으로 객체 생성
 	public Board(
 			String writer, String title, String content, Long writerId,

src/main/java/com/webtoonchat/toonchat/domain/like/controller/LikeController.java

@@ -0,0 +1,34 @@
+package com.webtoonchat.toonchat.domain.like.controller;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.webtoonchat.toonchat.domain.like.service.LikeService;
+import com.webtoonchat.toonchat.domain.member.entity.Member;
+import com.webtoonchat.toonchat.domain.member.service.MemberService;
+import com.webtoonchat.toonchat.resolver.annotation.Login;
+
+import io.jsonwebtoken.Claims;
+import jakarta.validation.constraints.Positive;
+import lombok.RequiredArgsConstructor;
+
+@RestController
+@RequestMapping("/api/likes")
+@RequiredArgsConstructor
+public class LikeController {
+
+	private final LikeService likeService;
+	private final MemberService memberService;
+
+	@PostMapping("/{boardId}")
+	public ResponseEntity addLike(@PathVariable("boardId")@Positive Long boardId, @Login Claims claims) {
+		Long userId = claims.get("userId", Long.class);
+		Member member = memberService.findByMemberId(userId);
+		likeService.addLike(boardId, member);
+		return ResponseEntity.status(HttpStatus.CREATED).build();
+	}
+}

src/main/java/com/webtoonchat/toonchat/domain/like/entity/Like.java

@@ -0,0 +1,39 @@
+package com.webtoonchat.toonchat.domain.like.entity;
+
+import com.webtoonchat.toonchat.domain.board.entity.Board;
+import com.webtoonchat.toonchat.domain.member.entity.Member;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@Table(name = "\"like\"") //이거 이름 안바꿔 주면 충돌남 SQL 예약어라서..
+@Setter
+@Getter
+@Entity
+@NoArgsConstructor
+public class Like {
+	@Id
+	@GeneratedValue(strategy = GenerationType.IDENTITY)
+	private Long likeId;
+
+	@ManyToOne(fetch = FetchType.LAZY)
+	@JoinColumn(name = "member_id")
+	private Member member;
+
+	@ManyToOne
+	@JoinColumn(name = "board_id")
+	private Board board;
+	public Like(Member member, Board board) {
+		this.member = member;
+		this.board = board;
+	}
+}

src/main/java/com/webtoonchat/toonchat/domain/like/repository/LikeRepository.java

@@ -0,0 +1,20 @@
+package com.webtoonchat.toonchat.domain.like.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import com.webtoonchat.toonchat.domain.board.entity.Board;
+import com.webtoonchat.toonchat.domain.like.entity.Like;
+import com.webtoonchat.toonchat.domain.member.entity.Member;
+
+@Repository
+public interface LikeRepository extends JpaRepository<Like, Long> {
+
+	//있는지 없는지 검토
+	boolean existsByMemberAndBoard(Member member, Board board);
+
+	//삭제
+	void deleteByMemberAndBoard(Member member, Board board);
+
+}
+

src/main/java/com/webtoonchat/toonchat/domain/like/service/LikeService.java

@@ -0,0 +1,32 @@
+package com.webtoonchat.toonchat.domain.like.service;
+
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.webtoonchat.toonchat.domain.board.entity.Board;
+import com.webtoonchat.toonchat.domain.board.service.BoardService;
+import com.webtoonchat.toonchat.domain.like.entity.Like;
+import com.webtoonchat.toonchat.domain.like.repository.LikeRepository;
+import com.webtoonchat.toonchat.domain.member.entity.Member;
+
+import lombok.RequiredArgsConstructor;
+
+
+@Service
+@RequiredArgsConstructor
+@Transactional
+public class LikeService {
+	private final BoardService boardService;
+	private final LikeRepository likeRepository;
+
+	public void addLike(Long boardId, Member member) {
+		Board board = boardService.findById(boardId);
+		if (!likeRepository.existsByMemberAndBoard(member, board)) {
+			board.setLikeCount(board.getLikeCount() + 1);
+			likeRepository.save(new Like(member, board));
+		} else {
+			board.setLikeCount(board.getLikeCount() - 1);
+			likeRepository.deleteByMemberAndBoard(member, board);
+		}
+	}
+}