#14 Fix: 게시글 좋아요 여부, 개수, 조회수, 댓글수 기능 추가

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

@@ -5,6 +5,7 @@
 import com.ixxp.culpop.dto.post.PostDetailResponse;
 import com.ixxp.culpop.dto.post.PostRequest;
 import com.ixxp.culpop.dto.post.PostResponse;
+import com.ixxp.culpop.entity.User;
 import com.ixxp.culpop.security.UserDetailsImpl;
 import com.ixxp.culpop.service.CommentService;
 import com.ixxp.culpop.service.PostService;
@@ -15,6 +16,7 @@
 import org.springframework.web.bind.annotation.*;
 
 import java.util.List;
+import java.util.Optional;
 
 @RestController
 @RequiredArgsConstructor
@@ -41,8 +43,10 @@ public ResponseEntity<List<PostResponse>> getPost(@RequestParam(name = "category
 
     // 게시글 개별 조회
     @GetMapping("/{postId}")
-    public ResponseEntity<PostDetailResponse> getPostDetail(@PathVariable int postId) {
-        return ResponseEntity.ok(postService.getPostDetail(postId));
+    public ResponseEntity<PostDetailResponse> getPostDetail(@AuthenticationPrincipal UserDetailsImpl userDetails,
+                                                            @PathVariable int postId) {
+        User user = Optional.ofNullable(userDetails).map(UserDetailsImpl::getUser).orElse(new User());
+        return ResponseEntity.ok(postService.getPostDetail(user, postId));
     }
 
     // 게시글 수정

src/main/java/com/ixxp/culpop/dto/post/PostDetailResponse.java

@@ -17,7 +17,9 @@ public class PostDetailResponse {
     private LocalDateTime createdAt;
     @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd")
     private LocalDateTime modifiedAt;
+    private String cateName;
+    private boolean likeCheck;
     private int likeCount;
     private int viewCount;
-    private String cateName;
+    private int commentCount;
 }

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

@@ -7,6 +7,7 @@
 public interface CommentMapper {
     void insertComment(Comment comment);
     Comment selectCommentDetail(int commentId);
+    int countCommentsByPostId(int postId);
     void updateComment(Comment comment);
     void deleteComment(int commentId);
 }

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

@@ -7,5 +7,6 @@
 public interface PostLikeMapper {
     void insertPostLike(PostLike postLike);
     boolean checkPostLike(int userId, int postId);
+    int countLikesByPostId(int postId);
     void deletePostLike(PostLike postLike);
 }

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

@@ -12,6 +12,8 @@ public interface PostMapper {
     Post selectPostDetail(int postId);
     List<Post> selectSearchPost(String word, int offset);
     List<Post> selectPostByUserId(int userId);
+    int selectPostViewCount(int postId);
+    void updatePostViewCount(int postId);
     void updatePost(Post post);
     void deletePost(int postId);
 }

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

@@ -8,6 +8,7 @@
 import com.ixxp.culpop.entity.PostLike;
 import com.ixxp.culpop.entity.User;
 import com.ixxp.culpop.mapper.CategoryMapper;
+import com.ixxp.culpop.mapper.CommentMapper;
 import com.ixxp.culpop.mapper.PostLikeMapper;
 import com.ixxp.culpop.mapper.PostMapper;
 import lombok.RequiredArgsConstructor;
@@ -24,6 +25,7 @@ public class PostService {
     private final CategoryMapper categoryMapper;
     private final PostMapper postMapper;
     private final PostLikeMapper postLikeMapper;
+    private final CommentMapper commentMapper;
 
     // 게시글 등록
     @Transactional
@@ -49,18 +51,22 @@ public List<PostResponse> getPost(String category, int page) {
     }
 
     // 게시글 개별 조회
-    public PostDetailResponse getPostDetail(int postId) {
+    public PostDetailResponse getPostDetail(User user, int postId) {
         Post post = postMapper.selectPostDetail(postId);
         if (post == null) {
             throw new IllegalArgumentException("post가 존재하지 않습니다.");
         }
 
-        // postlike 확인 후 개수만 가져오기
-        int likeCount = 0;
-        // 댓글 id, 개수 가져오기
+        boolean likeCheck = (user != null) && postLikeMapper.checkPostLike(user.getId(), postId);
+        int likeCount = postLikeMapper.countLikesByPostId(postId);
+
+        postMapper.updatePostViewCount(postId);
+        int viewCount = postMapper.selectPostViewCount(postId);
+
+        int commentCount = commentMapper.countCommentsByPostId(postId);
 
         return new PostDetailResponse(postId, post.getUser().getUsername(), post.getTitle(), post.getContent()
-                , post.getCreatedAt(), post.getModifiedAt(), likeCount, post.getViewCount(), post.getCategory().getCateName());
+                , post.getCreatedAt(), post.getModifiedAt(), post.getCategory().getCateName(), likeCheck, likeCount, viewCount, commentCount);
     }
 
     // 게시글 수정

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

@@ -30,6 +30,9 @@
         GROUP BY c.id, c.content, c.secret, c.parentId, c.createdAt, u.id, u.username, p.id
         ORDER BY c.createdAt;
     </select>
+    <select id="countCommentsByPostId" parameterType="int" resultType="int">
+        SELECT COUNT(*) FROM Comment WHERE postId = #{postId};
+    </select>
     <update id="updateComment" parameterType="Comment">
         UPDATE Comment SET content=#{content}, secret=#{secret}, parentId=#{parentId}
         WHERE id=#{id}

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

@@ -74,6 +74,12 @@
         GROUP BY p.id, p.title, p.createdAt, u.id, u.username, c.id, c.cateName
         ORDER BY p.createdAt
     </select>
+    <select id="selectPostViewCount" parameterType="int" resultType="int">
+        SELECT viewCount FROM Post WHERE id = #{postId};
+    </select>
+    <update id="updatePostViewCount" parameterType="int">
+        UPDATE Post SET viewCount = viewCount+1 WHERE id=#{postId}
+    </update>
     <update id="updatePost" parameterType="post">
         UPDATE Post SET title=#{title}, content=#{content}, categoryId=#{category.id}
         WHERE id=#{id}

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

@@ -9,6 +9,9 @@
     <select id="checkPostLike" parameterType="int" resultType="boolean">
         SELECT IF(COUNT(*) = 1, 1, 0) FROM PostLike WHERE userId=#{userId} and postId=#{postId}
     </select>
+    <select id="countLikesByPostId" parameterType="int" resultType="int">
+        SELECT COUNT(*) FROM PostLike WHERE postId = #{postId};
+    </select>
     <delete id="deletePostLike">
         DELETE FROM PostLike WHERE userId =#{user.id} and postId=#{post.id}
     </delete>