feat: 좋아요 기능 구현

src/main/java/com/wap/cano_be/controller/LikeController.java

@@ -0,0 +1,41 @@
+package com.wap.cano_be.controller;
+
+import com.wap.cano_be.domain.PrincipalDetail;
+import com.wap.cano_be.service.impl.LikeService;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/api")
+public class LikeController {
+    private final LikeService likeService;
+
+    public LikeController(LikeService likeService) {
+        this.likeService = likeService;
+    }
+
+    // 좋아요 등록
+    @PostMapping("/menus/{menu_id}/like")
+    public ResponseEntity<?> like(
+            @PathVariable("menu_id") long menuId,
+            @AuthenticationPrincipal PrincipalDetail principalDetail){
+        return likeService.insert(principalDetail.getMember().getId(), menuId);
+    }
+
+    // [TEST] 좋아요 한 메뉴 조회
+    @GetMapping("/likes/me")
+    public ResponseEntity<?> getLikes(
+            @AuthenticationPrincipal PrincipalDetail principalDetail
+    ) {
+        return likeService.getLikedMenus(principalDetail.getMember().getId());
+    }
+
+    // 좋아요 취소
+    @DeleteMapping("/menus/{menu_id}/like")
+    public ResponseEntity<?> unlike(
+            @PathVariable("menu_id") long menuId,
+            @AuthenticationPrincipal PrincipalDetail principalDetail){
+        return likeService.delete(principalDetail.getMember().getId(), menuId);
+    }
+}

src/main/java/com/wap/cano_be/controller/MenuController.java

@@ -128,28 +128,4 @@ public ResponseEntity<?> reportMenu(@RequestBody MenuReportDto menuReportDto){
         log.info("menuReportDto: {}", menuReportDto);
         return getSuccessResponse();
     }
-
-    // 좋아요
-//    @PostMapping("/{menu_id}/like")
-//    public ResponseEntity<?> setLike(
-//            @PathVariable("menu_id") long id,
-//            @RequestBody MenuLikeDto menuLikeDto,
-//            @AuthenticationPrincipal PrincipalDetail principalDetail){
-//
-//        if(menuLikeDto == null){
-//            Map<String, String> response = new HashMap<>();
-//            response.put("error", "잘못된 요청 양식 입니다.");
-//            return ResponseEntity.badRequest().body(response);
-//        }
-//
-//        Long memberId = principalDetail.getMember().getId();
-//        if(memberId == null){
-//            Map<String, String> response = new HashMap<>();
-//            response.put("error", "유효하지 않은 사용자입니다.");
-//            return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body(response);
-//        }
-//
-//        likeService.updateLike(memberId, id, menuLikeDto.like());
-//        return getSuccessResponse();
-//    }
 }

src/main/java/com/wap/cano_be/domain/Like.java

@@ -1,23 +1,27 @@
 package com.wap.cano_be.domain;
 
 import jakarta.persistence.*;
+import lombok.Builder;
+import lombok.Getter;
 
 @Entity
+@Getter
 @Table(name = "menu_like")
 public class Like {
     @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
-    @ManyToOne(targetEntity = Member.class, fetch = FetchType.LAZY)
+    @ManyToOne(fetch = FetchType.LAZY)
     @JoinColumn(name = "member_id")
     private Member member;
 
-    @ManyToOne(targetEntity = Menu.class, fetch = FetchType.LAZY)
+    @ManyToOne(fetch = FetchType.LAZY)
     @JoinColumn(name = "menu_id")
     private Menu menu;
 
     public Like() {}
 
+    @Builder
     public Like(Member member, Menu menu) {
         this.member = member;
         this.menu = menu;

src/main/java/com/wap/cano_be/domain/Member.java

@@ -6,6 +6,9 @@
 import jakarta.persistence.*;
 import lombok.*;
 
+import java.util.ArrayList;
+import java.util.List;
+
 @Entity
 @Getter
 @Setter
@@ -32,4 +35,6 @@ public class Member {
     private MemberRole role;
     @Enumerated(EnumType.STRING)
     private Gender gender;
+    @OneToMany(mappedBy = "member", cascade = CascadeType.REMOVE, orphanRemoval = true)
+    private List<Like> likes = new ArrayList<>();
 }

src/main/java/com/wap/cano_be/service/impl/LikeService.java

@@ -8,9 +8,15 @@
 import com.wap.cano_be.repository.MenuRepository;
 import jakarta.transaction.Transactional;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Service;
 
+import java.util.List;
+import java.util.stream.Collectors;
+
 @Service
+@Transactional
 public class LikeService {
     private final LikeRepository likeRepository;
     private final MemberRepository memberRepository;
@@ -23,24 +29,45 @@ public LikeService(LikeRepository likeRepository, MemberRepository memberReposit
         this.menuRepository = menuRepository;
     }
 
-//    @Transactional
-//    public void updateLike(long memberId, long menuId, boolean like){
-//        Member member = memberRepository.findBySocialId(memberId).orElseThrow(()->new IllegalArgumentException("Member not found"));
-//        Menu menu = menuRepository.findById(menuId);
-//
-//        // 좋아요 했다면
-//        if(like){
-//            // member - menu 간 join이 없다면
-//            if(!likeRepository.existsByMemberAndMenu(member, menu)){
-//                menu.increaseLikeCount();
-//                menuRepository.save(menu); // transactional 고려해 이후 제거할 수도 있음
-//                likeRepository.save(new Like(member, menu));
-//            }
-//        } else {
-//            // 좋아요 해제
-//            menu.decreaseLikeCount();
-//            menuRepository.save(menu);
-//            likeRepository.deleteByMemberAndMenu(member, menu);
-//        }
-//    }
+    public ResponseEntity<?> insert(long memberId, long menuId){
+        Member member = memberRepository.findById(memberId).orElseThrow(()->new IllegalArgumentException("Member not found"));
+        Menu menu = menuRepository.findById(menuId);
+
+        // 이미 좋아요라면 409 에러 반환
+        if(likeRepository.existsByMemberAndMenu(member, menu)){
+            return ResponseEntity.status(HttpStatus.CONFLICT).build();
+        }
+
+        // 좋아요 반영
+        Like like = Like.builder()
+                .member(member)
+                .menu(menu)
+                .build();
+        likeRepository.save(like);
+        return ResponseEntity.noContent().build();
+    }
+
+    public ResponseEntity<?> delete(long memberId, long menuId){
+        Member member = memberRepository.findById(memberId).orElseThrow(()->new IllegalArgumentException("Member not found"));
+        Menu menu = menuRepository.findById(menuId);
+
+        // 좋아요가 있다면 좋아요 해제
+        if(likeRepository.existsByMemberAndMenu(member, menu)){
+            likeRepository.deleteByMemberAndMenu(member, menu);
+            return ResponseEntity.noContent().build();
+        }
+
+        // 없으면 409 에러 반환
+        return ResponseEntity.status(HttpStatus.CONFLICT).build();
+    }
+
+    // [TEST] 좋아요한 메뉴 찾기
+    public ResponseEntity<List<Menu>> getLikedMenus(long memberId){
+        Member member = memberRepository.findById(memberId).orElseThrow(()->new IllegalArgumentException("Member not found"));
+        return ResponseEntity.ok().body(
+                member.getLikes().stream()
+                .map(Like::getMenu)
+                .collect(Collectors.toList()));
+    }
+
 }