[feat] 나만의 Bar(킵) 목록 조회 기능 구현 #23 (#29)

* refactor: Wishlist 엔티티를 MyBar 엔티티로 리팩토링 및 개선

- Wishlist 도메인을 MyBar 도메인으로 명칭 변경
- `createdAt` 필드에 `@CreatedDate` 어노테이션 적용하여 생성 시간 자동화
- Soft Delete 구현을 위해 `deletedAt` 필드 추가
- `WishlistStatus` enum을 `KeepStatus` enum으로 변경

* refactor: WishlistStatus enum을 KeepStatus enum으로 변경

- 도메인 명칭 변경에 맞춰 WishlistStatus enum 클래스를 KeepStatus로 변경
- enum 패키지 위치를 'wishlist'에서 'mybar'으로 이동

* refactor: 불필요한 Dto 삭제

* feat: 마이바 목록 조회 DTO 추가

- 마이바 목록 조회 시 사용될 MyBarListResponseDto 클래스 추가
- 페이징 처리를 위한 nextCursor 필드 추가

* refactor: WishlistResponseDto를 MyBarItemResponseDto로 리팩토링

- WishlistResponseDto 클래스를 MyBarItemResponseDto로 명칭 변경
- DTO가 사용자(User) 정보 대신 킵한 칵테일(Cocktail) 정보를 직접 포함하도록 수정

* refactor: WishlistRepository를 MyBarRepository로 리팩토링 및 쿼리 메소드 추가

- WishlistRepository 인터페이스를 MyBarRepository로 명칭 변경
- '나만의 바' 기능의 데이터 접근을 위해 쿼리 메소드 2개 추가
  - `findByUserIdAndStatusOrderByIdDesc`: 특정 사용자의 킵 목록을 페이징하여 조회
  - `countByUserIdAndStatus`: 특정 사용자의 활성 킵 개수를 카운트

* refactor: API 응답을 커서 기반 페이징 방식에서 오프셋 기반 페이징 방식으로 변경

* feat: 마이바(MyBar) 목록 조회 서비스 로직 구현

* feat: 마이바(MyBar) 목록 조회 API 구현

* fix typo

Author: MEOHIN

src/main/java/com/back/domain/mybar/controller/MyBarController.java

@@ -0,0 +1,33 @@
+package com.back.domain.mybar.controller;
+
+import com.back.domain.mybar.dto.MyBarListResponseDto;
+import com.back.domain.mybar.service.MyBarService;
+import com.back.global.rsData.RsData;
+import jakarta.validation.constraints.Max;
+import jakarta.validation.constraints.Min;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/me/bar")
+@RequiredArgsConstructor
+@Validated
+public class MyBarController {
+
+    private final MyBarService myBarService;
+
+    @GetMapping
+    public RsData<MyBarListResponseDto> getMyBarList(
+            @AuthenticationPrincipal(expression = "id") Long userId,
+            @RequestParam(defaultValue = "0") @Min(0) int page,
+            @RequestParam(defaultValue = "20") @Min(1) @Max(100) int pageSize
+    ) {
+        MyBarListResponseDto body = myBarService.getMyBar(userId, page, pageSize);
+        return RsData.successOf(body);  // code=200, message="success"
+    }
+}

src/main/java/com/back/domain/mybar/dto/MyBarItemResponseDto.java

@@ -0,0 +1,27 @@
+package com.back.domain.mybar.dto;
+
+import com.back.domain.mybar.entity.MyBar;
+import lombok.Builder;
+import lombok.Getter;
+
+import java.time.LocalDateTime;
+
+@Getter
+@Builder
+public class MyBarItemResponseDto {
+    private Long id;
+    private Long cocktailId;
+    private String cocktailName;
+    private String imageUrl;
+    private LocalDateTime createdAt;
+
+    public static MyBarItemResponseDto from(MyBar m) {
+        return MyBarItemResponseDto.builder()
+                .id(m.getId())
+                .cocktailId(m.getCocktail().getCocktailId())
+                .cocktailName(m.getCocktail().getCocktailName())
+                .imageUrl(m.getCocktail().getImageUrl())
+                .createdAt(m.getCreatedAt())
+                .build();
+    }
+}

src/main/java/com/back/domain/mybar/dto/MyBarListResponseDto.java

@@ -0,0 +1,14 @@
+package com.back.domain.mybar.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+import java.util.List;
+
+@Getter
+@AllArgsConstructor
+public class MyBarListResponseDto {
+    private List<MyBarItemResponseDto> items;
+    private boolean hasNext;   // 다음 페이지 존재 여부
+    private Integer nextPage;  // 다음 페이지 번호(없으면 null)
+}

src/main/java/com/back/domain/mybar/entity/MyBar.java

@@ -0,0 +1,47 @@
+package com.back.domain.mybar.entity;
+
+import com.back.domain.cocktail.entity.Cocktail;
+import com.back.domain.mybar.enums.KeepStatus;
+import com.back.domain.user.entity.User;
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+
+import java.time.LocalDateTime;
+
+@Entity
+@Getter
+@Setter
+@NoArgsConstructor
+@EntityListeners(AuditingEntityListener.class)
+public class MyBar {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    /** 킵 생성 시각 */
+    @CreatedDate
+    private LocalDateTime createdAt;
+
+    /** 킵 해제 시각 (ACTIVE일 때는 null) */
+    private LocalDateTime deletedAt;
+
+    /** 킵한 사용자 */
+    @ManyToOne
+    private User user;
+
+    /** 킵한 칵테일 */
+    @ManyToOne
+    private Cocktail cocktail;
+
+    /** 킵 상태 */
+    @Enumerated(EnumType.STRING)
+    @Column(nullable = false)
+    // 기본값은 ACTIVE (활성 상태)
+    // ACTIVE: 킵한 상태, DELETED: 킵 해제한 상태 (Soft Delete)
+    private KeepStatus status = KeepStatus.ACTIVE;
+}

src/main/java/com/back/domain/mybar/enums/KeepStatus.java

@@ -0,0 +1,9 @@
+package com.back.domain.mybar.enums;
+
+import lombok.Getter;
+
+@Getter
+public enum KeepStatus {
+    ACTIVE,
+    DELETED
+}

src/main/java/com/back/domain/mybar/repository/MyBarRepository.java

@@ -0,0 +1,17 @@
+package com.back.domain.mybar.repository;
+
+import com.back.domain.mybar.entity.MyBar;
+import com.back.domain.mybar.enums.KeepStatus;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface MyBarRepository extends JpaRepository<MyBar, Long> {
+    /** 나만의 bar(킵) 목록: ACTIVE만, id desc */
+    Page<MyBar> findByUserIdAndStatusOrderByIdDesc(Long userId, KeepStatus status, Pageable pageable);
+
+    /** 프로필/요약용: ACTIVE 개수 */
+    long countByUserIdAndStatus(Long userId, KeepStatus status);
+}

src/main/java/com/back/domain/mybar/service/MyBarService.java

@@ -0,0 +1,36 @@
+package com.back.domain.mybar.service;
+
+import com.back.domain.mybar.dto.MyBarItemResponseDto;
+import com.back.domain.mybar.dto.MyBarListResponseDto;
+import com.back.domain.mybar.entity.MyBar;
+import com.back.domain.mybar.enums.KeepStatus;
+import com.back.domain.mybar.repository.MyBarRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Service
+@RequiredArgsConstructor
+public class MyBarService {
+
+    private final MyBarRepository myBarRepository;
+
+    @Transactional(readOnly = true)
+    public MyBarListResponseDto getMyBar(Long userId, int page, int pageSize) {
+        Page<MyBar> myBarPage = myBarRepository.findByUserIdAndStatusOrderByIdDesc(userId, KeepStatus.ACTIVE, PageRequest.of(page, pageSize));
+
+        List<MyBar> myBars = myBarPage.getContent();
+        List<MyBarItemResponseDto> items = new ArrayList<>();
+        for (MyBar myBar : myBars) items.add(MyBarItemResponseDto.from(myBar));
+
+        boolean hasNext = myBarPage.hasNext();
+        Integer nextPage = hasNext ? myBarPage.getNumber() + 1 : null;
+
+        return new MyBarListResponseDto(items, hasNext, nextPage);
+    }
+}