Feat#21 게시물 생성, 삭제, 수정 API 구현

src/main/java/com/leets/team2/xclone/domain/member/repository/MemberRepository.java

@@ -11,4 +11,6 @@ public interface MemberRepository extends JpaRepository<Member, Long> {
   boolean existsByNicknameAndKakaoId(String nickname, Long kakaoId);
   Optional<Member> findByNicknameAndKakaoId(String nickname, Long kakaoId);
   boolean existsByTag(String tag);
+
+  Optional<Member>findByTag(String tag);
 }

src/main/java/com/leets/team2/xclone/domain/member/service/MemberService.java

@@ -6,6 +6,8 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
+import java.util.NoSuchElementException;
+
 @Service
 @RequiredArgsConstructor
 public class MemberService {
@@ -28,4 +30,9 @@ public void saveMember(Member member) {
   public boolean checkMemberExistsBy(String tag) {
     return this.memberRepository.existsByTag(tag);
   }
+
+  public Member findMemberByTag(String tag){
+    return this.memberRepository.findByTag(tag).orElseThrow(
+            NoSuchMemberException::new);
+  }
 }

src/main/java/com/leets/team2/xclone/domain/post/controller/PostController.java

@@ -1,4 +1,48 @@
 package com.leets.team2.xclone.domain.post.controller;
 
+import com.leets.team2.xclone.common.ApiData;
+import com.leets.team2.xclone.domain.member.entities.Member;
+import com.leets.team2.xclone.domain.member.service.MemberService;
+import com.leets.team2.xclone.domain.post.dto.PostDTO;
+import com.leets.team2.xclone.domain.post.entity.Post;
+import com.leets.team2.xclone.domain.post.service.PostService;
+import io.swagger.v3.oas.annotations.parameters.RequestBody;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/api/posts")
 public class PostController {
+    private final PostService postService;
+    private final MemberService memberService;
+
+    @PostMapping("/create")//게시물 생성
+    public ResponseEntity<ApiData<PostDTO>> createPost(@RequestParam String authorTag, @RequestBody @Validated PostDTO postDTO){
+        Member author=memberService.findMemberByTag(authorTag);
+        Post post=postService.createPost(postDTO,author);
+        return ApiData.created(new PostDTO(
+                post.getId(),
+                post.getTitle(),
+                post.getContent()
+        ));
+    }
+
+    @PatchMapping("/{postId}/edit")
+    public ResponseEntity<ApiData<PostDTO>> updatePost(@PathVariable Long postId,@RequestBody @Validated PostDTO postDTO){
+        Post updatedPost=postService.updatePost(postId,postDTO);
+        return ApiData.ok(new PostDTO(
+                updatedPost.getId(),
+                updatedPost.getTitle(),
+                updatedPost.getContent()
+        ));
+    }
+
+    @DeleteMapping("/{postId}/delete")
+    public ResponseEntity<ApiData<Void>> deletePost(@PathVariable Long postId){
+        postService.deletePost(postId);
+        return ApiData.ok(null);
+    }
 }

src/main/java/com/leets/team2/xclone/domain/post/dto/PostDTO.java

@@ -1,27 +1,23 @@
 package com.leets.team2.xclone.domain.post.dto;
 
 import jakarta.validation.constraints.NotBlank;
-import jakarta.validation.constraints.NotNull;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
 
+@Data
+@Builder
+@AllArgsConstructor
+@NoArgsConstructor
 public class PostDTO {
-    //DTO 같은 경우 각각의 기능에 따른 DTO를 전부 만들 예정입니다. 다음은 예시 상황입니다. 이런 방식으로 구현하는건 어떻게 생각하시는지 의견 부탁드리겠습니다.
-    public record CreatePostRequest(
-            @NotNull(message = "아이디는 필수입니다.")
-            Long postId,
 
-            @NotBlank(message = "제목은 필수입니다.")
-            String title,
+    private Long id;//게시물 id
+
+    @NotBlank
+    private String title;//제목
+
+    @NotBlank
+    private String content;//내용
 
-            @NotBlank(message = "내용은 필수입니다.")
-            String content
-    ){}
-    public record CreatePostResponse(
-            Long postId,
-            String title,
-            String content
-    ){
-        public static CreatePostResponse of(Long postId,String title,String content) {
-            return new CreatePostResponse(postId,title,content);
-        }
-    }
 }

src/main/java/com/leets/team2/xclone/domain/post/entity/Post.java

@@ -4,6 +4,7 @@
 import com.leets.team2.xclone.domain.member.entities.Member;
 import jakarta.persistence.*;
 import lombok.*;
+import org.springframework.stereotype.Service;
 
 import java.time.LocalDateTime;
 
@@ -13,15 +14,16 @@
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
 @AllArgsConstructor(access = AccessLevel.PRIVATE)
 @Getter
+@Setter
 public class Post extends AbstractEntity {//정말 기본적인 부분들만 일단 만들어냈습니다.
     @Column(name="title",nullable = false)
     private String title;
 
     @Column(name="content",nullable = false)
     private String content;
 
-    @ManyToOne
-    @JoinColumn(name="member_id",nullable = false)
-    private Member member;
+    @ManyToOne(fetch=FetchType.LAZY)//Member랑 다대일
+    @JoinColumn(name="author_id",nullable = false)//author_id로 Member와 연결
+    private Member author;//작성자를 멤버 객체로.
 
 }

src/main/java/com/leets/team2/xclone/domain/post/repository/PostRepository.java

@@ -2,6 +2,8 @@
 
 import com.leets.team2.xclone.domain.post.entity.Post;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
 
+@Repository
 public interface PostRepository extends JpaRepository<Post,Long> {
 }

src/main/java/com/leets/team2/xclone/domain/post/service/PostService.java

@@ -1,12 +1,43 @@
 package com.leets.team2.xclone.domain.post.service;
 
+import com.leets.team2.xclone.domain.member.entities.Member;
 import com.leets.team2.xclone.domain.member.repository.MemberRepository;
+import com.leets.team2.xclone.domain.member.service.MemberService;
+import com.leets.team2.xclone.domain.post.dto.PostDTO;
+import com.leets.team2.xclone.domain.post.entity.Post;
 import com.leets.team2.xclone.domain.post.repository.PostRepository;
+import com.leets.team2.xclone.exception.PostNotFoundException;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
+import java.util.NoSuchElementException;
+
 @Service
 @RequiredArgsConstructor
 public class PostService {
     private final PostRepository postRepository;
+
+    public Post createPost(PostDTO postDTO, Member author){
+        Post post=Post.builder()
+                .title(postDTO.getTitle())
+                .content(postDTO.getContent())
+                .author(author)
+                .build();
+        return postRepository.save(post);
+    }
+
+    public Post updatePost(Long postId,PostDTO postDTO){
+        Post post=postRepository.findById(postId)
+                .orElseThrow(PostNotFoundException::new);
+        post.setTitle(postDTO.getTitle());
+        post.setContent(postDTO.getContent());
+        return postRepository.save(post);
+    }
+
+    public void deletePost(Long postId){
+        if(!postRepository.existsById(postId)){//게시물이 없을 경우 예외 발생
+            throw new PostNotFoundException();
+        }
+        postRepository.deleteById(postId);//해당 게시물 아이디의 게시물 삭제
+    }
 }

src/main/java/com/leets/team2/xclone/exception/ErrorInfo.java

@@ -15,6 +15,8 @@ public enum ErrorInfo {
   NO_SUCH_MEMBER(HttpStatus.NOT_FOUND, "해당 멤버를 찾을 수 없습니다.", 10001),
   ALREADY_EXIST_MEMBER(HttpStatus.CONFLICT, "이미 존재하는 멤버입니다.", 10002),
 
+  NO_SUCH_POST(HttpStatus.NOT_FOUND,"해당 게시물을 찾을 수 없습니다.",10003),//게시물을 못 찾았을 때 에러 정보
+
   // jwt 영역
   INVALID_TOKEN(HttpStatus.BAD_REQUEST, "잘못된 토큰입니다.", 10100);
 

src/main/java/com/leets/team2/xclone/exception/PostNotFoundException.java

@@ -0,0 +1,7 @@
+package com.leets.team2.xclone.exception;
+
+public class PostNotFoundException extends ApplicationException{//게시물을 찾지 못했을 경우 에러
+    public PostNotFoundException(){
+        super(ErrorInfo.NO_SUCH_POST);
+    }
+}

src/main/java/com/leets/team2/xclone/exception/handler/GlobalExceptionHandler.java

@@ -2,6 +2,7 @@
 
 import com.leets.team2.xclone.common.ApiData;
 import com.leets.team2.xclone.exception.ApplicationException;
+import com.leets.team2.xclone.exception.PostNotFoundException;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
@@ -41,4 +42,9 @@ public String handleAnyCheckedException(Exception e) {
   public ResponseEntity<ApiData<String>> handleMethodArgumentNotValidException(MethodArgumentNotValidException e) {
     return ApiData.validationFailure(e.getFieldErrors());
   }
+
+  @ExceptionHandler(PostNotFoundException.class)
+  public ResponseEntity<ApiData<String>> handlePostNotFoundException(PostNotFoundException e){
+    return ApiData.errorFrom(e.getErrorInfo());
+  }
 }