Merge pull request #24 from kookmin-sw/BE_Feature/#22-comment

#22

backend/src/main/java/com/project/capstone/comment/controller/CommentController.java

@@ -0,0 +1,33 @@
+package com.project.capstone.comment.controller;
+
+import com.project.capstone.auth.domain.PrincipalDetails;
+import com.project.capstone.comment.controller.dto.CommentResponse;
+import com.project.capstone.comment.controller.dto.CreateCommentRequest;
+import com.project.capstone.comment.service.CommentService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/comment")
+public class CommentController {
+
+    private final CommentService commentService;
+
+    @PostMapping("create")
+    public ResponseEntity<?> createComment(@AuthenticationPrincipal PrincipalDetails details,
+                                           @RequestParam Long postId, @RequestBody CreateCommentRequest request) {
+        commentService.createPost(details.getUserId(), postId, request);
+        return ResponseEntity.ok().body("댓글 생성 완료");
+    }
+
+    @GetMapping("/{id}")
+    public ResponseEntity<?> getComment(@AuthenticationPrincipal PrincipalDetails details,
+                                        @PathVariable Long id) {
+        CommentResponse commentResponse = commentService.getComment(details.getUserId(), id);
+        return ResponseEntity.ok().body(commentResponse);
+    }
+
+}

backend/src/main/java/com/project/capstone/comment/controller/dto/CommentResponse.java

@@ -0,0 +1,18 @@
+package com.project.capstone.comment.controller.dto;
+
+import com.project.capstone.comment.domain.Comment;
+
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+public record CommentResponse(
+        Long id,
+        Long postId,
+        UUID memberId,
+        String body,
+        LocalDateTime createdAt
+) {
+    public CommentResponse(Comment comment) {
+        this(comment.getId(), comment.getPost().getId(), comment.getMember().getId(), comment.getBody(), comment.getCreatedAt());
+    }
+}

backend/src/main/java/com/project/capstone/comment/controller/dto/CreateCommentRequest.java

@@ -0,0 +1,6 @@
+package com.project.capstone.comment.controller.dto;
+
+public record CreateCommentRequest (
+        String body
+) {
+}

backend/src/main/java/com/project/capstone/comment/domain/Comment.java

@@ -1,5 +1,6 @@
 package com.project.capstone.comment.domain;
 
+import com.fasterxml.jackson.annotation.JsonBackReference;
 import com.project.capstone.member.domain.Member;
 import com.project.capstone.post.domain.Post;
 import jakarta.persistence.*;
@@ -27,9 +28,11 @@ public class Comment {
     @Column(name = "created_at")
     private LocalDateTime createdAt;
 
+    @JsonBackReference
     @ManyToOne
     private Member member;
 
+    @JsonBackReference
     @ManyToOne
     private Post post;
 }

backend/src/main/java/com/project/capstone/comment/domain/CommentRepository.java

@@ -0,0 +1,9 @@
+package com.project.capstone.comment.domain;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface CommentRepository extends JpaRepository<Comment, Long> {
+    Optional<Comment> findCommentById(Long id);
+}

backend/src/main/java/com/project/capstone/comment/exception/CommentException.java

@@ -0,0 +1,10 @@
+package com.project.capstone.comment.exception;
+
+import com.project.capstone.common.exception.BaseException;
+import com.project.capstone.common.exception.ExceptionType;
+
+public class CommentException extends BaseException {
+    public CommentException(ExceptionType exceptionType) {
+        super(exceptionType);
+    }
+}

backend/src/main/java/com/project/capstone/comment/exception/CommentExceptionType.java

@@ -0,0 +1,32 @@
+package com.project.capstone.comment.exception;
+
+import com.project.capstone.common.exception.ExceptionType;
+import lombok.AllArgsConstructor;
+import org.springframework.http.HttpStatus;
+
+import static org.springframework.http.HttpStatus.NOT_FOUND;
+
+@AllArgsConstructor
+public enum CommentExceptionType implements ExceptionType {
+    COMMENT_NOT_FOUND(NOT_FOUND, 501, "해당 댓글을 찾을 수 없습니다.");
+    ;
+
+    private final HttpStatus status;
+    private final int exceptionCode;
+    private final String message;
+
+    @Override
+    public HttpStatus httpStatus() {
+        return status;
+    }
+
+    @Override
+    public int exceptionCode() {
+        return exceptionCode;
+    }
+
+    @Override
+    public String message() {
+        return message;
+    }
+}

backend/src/main/java/com/project/capstone/comment/service/CommentService.java

@@ -0,0 +1,62 @@
+package com.project.capstone.comment.service;
+
+import com.project.capstone.comment.controller.dto.CommentResponse;
+import com.project.capstone.comment.controller.dto.CreateCommentRequest;
+import com.project.capstone.comment.domain.Comment;
+import com.project.capstone.comment.domain.CommentRepository;
+import com.project.capstone.comment.exception.CommentException;
+import com.project.capstone.member.domain.Member;
+import com.project.capstone.member.domain.MemberRepository;
+import com.project.capstone.member.exception.MemberException;
+import com.project.capstone.post.domain.Post;
+import com.project.capstone.post.domain.PostRepository;
+import com.project.capstone.post.exception.PostException;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+
+import java.util.UUID;
+
+import static com.project.capstone.comment.exception.CommentExceptionType.COMMENT_NOT_FOUND;
+import static com.project.capstone.member.exception.MemberExceptionType.MEMBER_NOT_FOUND;
+import static com.project.capstone.post.exception.PostExceptionType.POST_NOT_FOUND;
+
+@Service
+@RequiredArgsConstructor
+@Slf4j
+public class CommentService {
+
+    private final CommentRepository commentRepository;
+    private final MemberRepository memberRepository;
+    private final PostRepository postRepository;
+
+    public void createPost(String userId, Long postId, CreateCommentRequest request) {
+        Member member = memberRepository.findMemberById(UUID.fromString(userId)).orElseThrow(
+                () -> new MemberException(MEMBER_NOT_FOUND)
+        );
+
+        Post post = postRepository.findPostById(postId).orElseThrow(
+                () -> new PostException(POST_NOT_FOUND)
+        );
+
+        Comment saved = commentRepository.save(Comment.builder()
+                .body(request.body())
+                .member(member)
+                .post(post)
+                .build());
+
+        member.getComments().add(saved);
+        post.getComments().add(saved);
+    }
+
+
+    public CommentResponse getComment(String userId, Long id) {
+        if (memberRepository.findMemberById(UUID.fromString(userId)).isEmpty()) {
+            throw new MemberException(MEMBER_NOT_FOUND);
+        }
+        Comment comment = commentRepository.findCommentById(id).orElseThrow(
+                () -> new CommentException(COMMENT_NOT_FOUND)
+        );
+        return new CommentResponse(comment);
+    }
+}

backend/src/main/java/com/project/capstone/member/controller/MemberController.java

@@ -10,7 +10,6 @@
 @RequiredArgsConstructor
 @RequestMapping("/member")
 public class MemberController {
-
     @GetMapping("/test")
     public ResponseEntity<?> test() {
         return ResponseEntity.ok("ok");

backend/src/main/java/com/project/capstone/member/domain/Member.java

@@ -1,5 +1,6 @@
 package com.project.capstone.member.domain;
 
+import com.fasterxml.jackson.annotation.JsonManagedReference;
 import com.project.capstone.auth.controller.dto.SignupRequest;
 import com.project.capstone.comment.domain.Comment;
 import com.project.capstone.memberclub.domain.MemberClub;
@@ -38,15 +39,19 @@ public class Member {
     @Column(name = "created_at")
     private LocalDateTime createdAt;
 
+    @JsonManagedReference
     @OneToMany(mappedBy = "member")
     private List<MemberClub> clubs = new ArrayList<>();
 
+    @JsonManagedReference
     @OneToMany(mappedBy = "member")
     private List<Post> posts = new ArrayList<>();
 
+    @JsonManagedReference
     @OneToMany(mappedBy = "member")
     private List<Comment> comments = new ArrayList<>();
 
+    @JsonManagedReference
     @OneToMany(mappedBy = "member")
     private List<Content> contents = new ArrayList<>();
 

backend/src/main/resources/data.sql

@@ -46,3 +46,10 @@ insert into member_club (id, member_id, club_id) values
 
 insert into post (id, club_id, member_id, title, body, created_at, is_sticky) values
 (1, 1, UNHEX(REPLACE("3f06af63-a93c-11e4-9797-00505690773f", "-","")), '게시글 제목 1', '게시글 내용 1', '2023-05-26 15:48:57.450179', true);
+
+insert into comment (id, post_id, member_id, body, created_at) values
+(1, 1, UNHEX(REPLACE("3f06af63-a93c-11e4-9797-00505690773f", "-","")), "댓글 1", "2023-05-26 15:48:57.450179");
+insert into comment (id, post_id, member_id, body, created_at) values
+    (2, 1, UNHEX(REPLACE("3f06af63-a93c-11e4-9797-00505690773f", "-","")), "댓글 2", "2023-05-26 15:48:57.450179");
+insert into comment (id, post_id, member_id, body, created_at) values
+    (3, 1, UNHEX(REPLACE("3f06af63-a93c-11e4-9797-00505690773f", "-","")), "댓글 3", "2023-05-26 15:48:57.450179");