feat: comment 기능 구현

src/main/java/com/example/ReMap/domain/auth/entity/RefreshToken.java

@@ -1,77 +1,45 @@
 package com.example.ReMap.domain.auth.entity;
 
-
 import com.example.ReMap.domain.member.Member;
 import jakarta.persistence.*;
+import lombok.*;
 import java.time.LocalDateTime;
 
-
 @Entity
 @Table(name = "refresh_token")
+@Getter @Setter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+@Builder
 public class RefreshToken {
 
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
-    @OneToOne(fetch = FetchType.LAZY)
-    @JoinColumn(name = "member_id", nullable = false)
+    // Member 삭제 시 토큰도 함께 삭제
+    @OneToOne(fetch = FetchType.LAZY, optional = false, cascade = CascadeType.REMOVE)
+    @JoinColumn(name = "member_id", nullable = false, unique = true)
     private Member member;
 
-    @Column(name = "refresh_token", nullable = false)
+    @Column(name = "refresh_token", nullable = false, length = 512)
     private String refreshToken;
 
-    @Column(name = "created_at")
+    @Column(name = "created_at", nullable = false)
     private LocalDateTime createdAt;
 
-    @Column(name = "updated_at")
+    @Column(name = "updated_at", nullable = false)
     private LocalDateTime updatedAt;
 
-    // 기본 생성자
-    public RefreshToken() {}
-
-    // 생성자
-    public RefreshToken(Member member, String refreshToken, LocalDateTime createdAt, LocalDateTime updatedAt) {
-        this.member = member;
-        this.refreshToken = refreshToken;
-        this.createdAt = createdAt;
-        this.updatedAt = updatedAt;
-    }
-
-    // Getter / Setter
-    public Long getId() {
-        return id;
-    }
-
-    public Member getMember() {
-        return member;
-    }
-
-    public void setMember(Member member) {
-        this.member = member;
-    }
-
-    public String getRefreshToken() {
-        return refreshToken;
-    }
-
-    public void setRefreshToken(String refreshToken) {
-        this.refreshToken = refreshToken;
-    }
-
-    public LocalDateTime getCreatedAt() {
-        return createdAt;
-    }
-
-    public void setCreatedAt(LocalDateTime createdAt) {
-        this.createdAt = createdAt;
-    }
-
-    public LocalDateTime getUpdatedAt() {
-        return updatedAt;
+    @PrePersist
+    public void prePersist() {
+        LocalDateTime now = LocalDateTime.now();
+        this.createdAt = now;
+        this.updatedAt = now;
     }
 
-    public void setUpdatedAt(LocalDateTime updatedAt) {
-        this.updatedAt = updatedAt;
+    @PreUpdate
+    public void preUpdate() {
+        this.updatedAt = LocalDateTime.now();
     }
 }

src/main/java/com/example/ReMap/domain/cast/Cast.java

@@ -1,6 +1,7 @@
 package com.example.ReMap.domain.cast;
 
 import com.example.ReMap.domain.member.Member;
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import jakarta.persistence.*;
 
 import java.time.LocalDateTime;
@@ -20,6 +21,7 @@ public class Cast {
 
     @ManyToOne
     @JoinColumn(name = "member_id")
+    @JsonIgnore
     private Member member;
 
     // 생성자, getter, setter

src/main/java/com/example/ReMap/domain/cast/CastRepository.java

@@ -0,0 +1,12 @@
+package com.example.ReMap.domain.cast;
+
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+/**
+ * Cast(게시글) 전용 JPA 레포지토리
+ * → JpaRepository 를 상속하면 findById, save, delete 등 기본 메서드가 자동 생성됩니다.
+ */
+public interface CastRepository extends JpaRepository<Cast, Long> {
+    // 필요하면 여기에 커스텀 쿼리 메서드 추가
+}

src/main/java/com/example/ReMap/domain/comment/Comment.java

@@ -2,27 +2,50 @@
 
 import com.example.ReMap.domain.cast.Cast;
 import com.example.ReMap.domain.member.Member;
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import jakarta.persistence.*;
+import lombok.*;
+import org.hibernate.annotations.CreationTimestamp;
 
 import java.time.LocalDateTime;
 
 @Entity
 @Table(name = "comment")
+@Getter
+@Setter                              // 전체 Setter 허용
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+@Builder
 public class Comment {
-    @Id
-    @GeneratedValue(strategy = GenerationType.IDENTITY)
+
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
+    /** VARCHAR(255) 에 맞춤 */
+    @Column(length = 255, nullable = false)
     private String content;
 
+    /** 생성 시각 – DB 기본값 대신 애플리케이션에서 채움 */
+    @CreationTimestamp
+    @Column(name = "created_at")
     private LocalDateTime createdAt;
 
-    @ManyToOne
+    /* ---------- 연관 관계 ---------- */
+
+    /** 작성자 – DDL이 NULL 허용 → optional = true */
+    @ManyToOne(fetch = FetchType.LAZY, optional = true)
     @JoinColumn(name = "member_id")
+    @JsonIgnore
     private Member member;
 
-    @ManyToOne
+    /** 대상 캐스트 – DDL이 NULL 허용 → optional = true */
+    @ManyToOne(fetch = FetchType.LAZY, optional = true)
     @JoinColumn(name = "cast_id")
     private Cast cast;
-}
 
+    /* ---------- 도메인 메서드 ---------- */
+
+    public void changeContent(String newContent) {
+        this.content = newContent;
+    }
+}

src/main/java/com/example/ReMap/domain/comment/CommentController.java

@@ -0,0 +1,64 @@
+package com.example.ReMap.domain.comment;
+
+import com.example.ReMap.domain.comment.CommentService;
+import com.example.ReMap.domain.comment.dto.CommentResponse;
+import com.example.ReMap.domain.comment.dto.CreateCommentRequest;
+import com.example.ReMap.domain.comment.dto.UpdateCommentRequest;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.security.Principal;
+import java.util.List;
+
+@RestController
+@RequestMapping("/casts/{castId}/comments")
+@RequiredArgsConstructor
+public class CommentController {
+
+    private final CommentService commentService;
+
+    /* ------------------------------------ 1. 댓글 등록 ------------------------------------ */
+    @PostMapping
+    public ResponseEntity<CommentResponse> create(
+            @PathVariable Long castId,
+            @RequestBody @Valid CreateCommentRequest req,
+            Principal principal            // 로그인 사용자 정보(아이디 문자열)
+    ) {
+        Long memberId = Long.valueOf(principal.getName());   // "1" → 1L 등으로 변환
+        CommentResponse resp = commentService.create(castId, memberId, req.getContent());
+        return ResponseEntity.status(HttpStatus.CREATED).body(resp);
+    }
+
+    /* ------------------------------------ 2. 댓글 목록 ------------------------------------ */
+    @GetMapping
+    public List<CommentResponse> list(@PathVariable Long castId) {
+        return commentService.list(castId);
+    }
+
+    /* ------------------------------------ 3. 댓글 수정 ------------------------------------ */
+    @PutMapping("/{commentId}")
+    public CommentResponse update(
+            @PathVariable Long castId,      // 경로 일관성 확보용
+            @PathVariable Long commentId,
+            @RequestBody @Valid UpdateCommentRequest req,
+            Principal principal
+    ) {
+        Long memberId = Long.valueOf(principal.getName());
+        return commentService.update(commentId, memberId, req.getContent());
+    }
+
+    /* ------------------------------------ 4. 댓글 삭제 ------------------------------------ */
+    @DeleteMapping("/{commentId}")
+    public ResponseEntity<Void> delete(
+            @PathVariable Long castId,
+            @PathVariable Long commentId,
+            Principal principal
+    ) {
+        Long memberId = Long.valueOf(principal.getName());
+        commentService.delete(commentId, memberId);
+        return ResponseEntity.noContent().build();
+    }
+}

src/main/java/com/example/ReMap/domain/comment/CommentRepository.java

@@ -0,0 +1,21 @@
+package com.example.ReMap.domain.comment;
+
+
+import org.springframework.data.jpa.repository.EntityGraph;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+
+/**
+ * 댓글 레포지토리
+ *
+ * • findByCastIdOrderByCreatedAtAsc()  :   특정 Cast(게시글)의 댓글을
+ *   작성 시간순으로 가져옵니다.
+ * • @EntityGraph("member")            :   댓글과 작성자를 한 번에 로딩해서
+ *   N+1 쿼리 문제를 예방합니다.
+ */
+public interface CommentRepository extends JpaRepository<Comment, Long> {
+
+    @EntityGraph(attributePaths = "member")      // 댓글 조회 + Member 한 번에 가져오기
+    List<Comment> findByCastIdOrderByCreatedAtAsc(Long castId);
+}

src/main/java/com/example/ReMap/domain/comment/CommentService.java

@@ -0,0 +1,91 @@
+package com.example.ReMap.domain.comment;
+
+
+import com.example.ReMap.domain.cast.Cast;
+import com.example.ReMap.domain.comment.Comment;
+import com.example.ReMap.domain.comment.CommentRepository;
+import com.example.ReMap.domain.member.Member;
+import com.example.ReMap.domain.member.MemberRepository;
+import com.example.ReMap.domain.comment.dto.CommentResponse;
+import jakarta.transaction.Transactional;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.access.AccessDeniedException;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+@RequiredArgsConstructor          // 의존성 주입용 생성자 자동
+@Transactional                    // 메서드 기본 read-write
+public class CommentService {
+
+    private final CommentRepository commentRepo;
+    private final com.example.ReMap.domain.cast.CastRepository castRepo;
+    private final MemberRepository  memberRepo;
+
+    /* ---------- CREATE ---------- */
+
+    public CommentResponse create(Long castId, Long memberId, String content) {
+
+        Cast cast = castRepo.findById(castId)
+                .orElseThrow(() -> new IllegalArgumentException("Cast not found : " + castId));
+
+        Member member = memberRepo.findById(memberId)
+                .orElseThrow(() -> new IllegalArgumentException("Member not found : " + memberId));
+
+        // 댓글 엔티티 생성
+        Comment comment = Comment.builder()
+                .content(content)
+                .build();
+
+        // FK 세팅 (엔티티 @Setter 덕분에 가능)
+        comment.setCast(cast);
+        comment.setMember(member);
+
+        // 저장
+        commentRepo.save(comment);
+
+        return CommentResponse.from(comment);
+    }
+
+    /* ---------- READ (목록) ---------- */
+    @Transactional(Transactional.TxType.SUPPORTS)   // read-only 트랜잭션
+    public List<CommentResponse> list(Long castId) {
+        return commentRepo.findByCastIdOrderByCreatedAtAsc(castId)
+                .stream()
+                .map(CommentResponse::from)
+                .toList();
+    }
+
+    /* ---------- UPDATE ---------- */
+
+    public CommentResponse update(Long commentId, Long requesterId, String newContent) {
+
+        Comment comment = commentRepo.findById(commentId)
+                .orElseThrow(() -> new IllegalArgumentException("Comment not found : " + commentId));
+
+        // 작성자 권한 확인
+        if (!requesterId.equals(comment.getMember() != null ? comment.getMember().getId() : null)) {
+            throw new AccessDeniedException("본인 댓글만 수정할 수 있습니다.");
+        }
+
+        comment.changeContent(newContent);   // 엔티티 내부에서 필드 변경
+
+        return CommentResponse.from(comment);
+    }
+
+    /* ---------- DELETE ---------- */
+
+    public void delete(Long commentId, Long requesterId) {
+
+        Comment comment = commentRepo.findById(commentId)
+                .orElseThrow(() -> new IllegalArgumentException("Comment not found : " + commentId));
+
+        if (!requesterId.equals(comment.getMember() != null ? comment.getMember().getId() : null)) {
+            throw new AccessDeniedException("본인 댓글만 삭제할 수 있습니다.");
+        }
+
+        commentRepo.delete(comment);          // 하드 삭제
+        // → 소프트 삭제가 필요하면 Comment에 deleted 필드를 추가해 플래그만 변경
+    }
+}

src/main/java/com/example/ReMap/domain/comment/dto/CommentResponse.java

@@ -0,0 +1,31 @@
+package com.example.ReMap.domain.comment.dto;
+
+
+import com.example.ReMap.domain.comment.Comment;
+import lombok.Builder;
+import lombok.Getter;
+
+import java.time.LocalDateTime;
+
+/** 댓글 단건 응답 DTO */
+@Getter
+@Builder
+public class CommentResponse {
+
+    private Long id;               // 댓글 ID
+    private Long memberId;         // 작성자 ID
+    private String nickname;       // 작성자 닉네임
+    private String content;        // 댓글 본문
+    private LocalDateTime createdAt;
+
+    /** Comment 엔티티 → DTO 변환 */
+    public static CommentResponse from(Comment c) {
+        return CommentResponse.builder()
+                .id(c.getId())
+                .memberId(c.getMember() != null ? c.getMember().getId() : null)
+                .nickname(c.getMember() != null ? c.getMember().getNickname() : "탈퇴한 회원")
+                .content(c.getContent())
+                .createdAt(c.getCreatedAt())
+                .build();
+    }
+}