#15 Feat: 게시글 수정 기능 구현

src/main/java/com/ixxp/culpop/controller/PostController.java

@@ -41,4 +41,14 @@ public ResponseEntity<List<PostResponse>> getPost(@RequestParam(name = "category
     public ResponseEntity<PostDetailResponse> getPostDetail(@PathVariable int postId) {
         return ResponseEntity.ok(postService.getPostDetail(postId));
     }
+
+    // 게시글 수정
+    @PatchMapping("/{postId}")
+    public ResponseEntity<StatusResponse> updatePost(@AuthenticationPrincipal UserDetailsImpl userDetails,
+                                                     @PathVariable int postId,
+                                                     @RequestBody PostRequest postRequest) {
+        postService.updatePost(userDetails.getUser(), postId, postRequest);
+        StatusResponse statusResponse = new StatusResponse(HttpStatus.OK.value(), "post 수정 완료");
+        return ResponseEntity.ok(statusResponse);
+    }
 }

src/main/java/com/ixxp/culpop/entity/Post.java

@@ -37,4 +37,11 @@ public Post(User user, Category category, String title, String content) {
         this.content = content;
         this.viewCount = 0;
     }
+
+    public void updatePost(User user, Category category, String title, String content) {
+        this.user = user;
+        this.category = category;
+        this.title = title;
+        this.content = content;
+    }
 }

src/main/java/com/ixxp/culpop/mapper/PostMapper.java

@@ -10,4 +10,5 @@ public interface PostMapper {
     void insertPost(Post post);
     List<Post> selectPost(String category, int offset);
     Post selectPostDetail(int postId);
+    void updatePost(Post post);
 }

src/main/java/com/ixxp/culpop/service/PostService.java

@@ -13,6 +13,7 @@
 import org.springframework.transaction.annotation.Transactional;
 
 import java.util.List;
+import java.util.Objects;
 import java.util.stream.Collectors;
 
 @Service
@@ -58,4 +59,30 @@ public PostDetailResponse getPostDetail(int postId) {
         return new PostDetailResponse(postId, post.getUser().getUsername(), post.getTitle(), post.getContent()
                 , post.getCreatedAt(), post.getModifiedAt(), likeCount, post.getViewCount(), post.getCategory().getCateName());
     }
+
+    // 게시글 수정
+    @Transactional
+    public void updatePost(User user, int postId, PostRequest postRequest) {
+        Post post = postMapper.selectPostDetail(postId);
+        if (post == null) {
+            throw new IllegalArgumentException("post가 존재하지 않습니다.");
+        }
+
+        if (post.getUser().getId() != user.getId()) {
+            throw new IllegalArgumentException("작성자만 수정 가능합니다.");
+        }
+
+        String cateName = postRequest.getCateName();
+        Category category = post.getCategory();
+        if (!Objects.equals(cateName, post.getCategory().getCateName())) {
+            category = categoryMapper.selectCategory(cateName);
+            if (category == null) {
+                category = new Category(cateName);
+                categoryMapper.insertCategory(category);
+            }
+        }
+
+        post.updatePost(user, category, postRequest.getTitle(), postRequest.getContent());
+        postMapper.updatePost(post);
+    }
 }

src/main/resources/mapper/post-mapper.xml

@@ -55,4 +55,8 @@
         LEFT JOIN Category c ON p.categoryId = c.id
         WHERE p.id=#{id}
     </select>
+    <update id="updatePost" parameterType="post">
+        UPDATE Post SET title=#{title}, content=#{content}, categoryId=#{category.id}
+        WHERE id=#{id}
+    </update>
 </mapper>