feat(playlist): 增加歌单收藏和评论功能

- 在 CommentServiceImpl 中添加歌单评论相关逻辑
- 在 PlaylistServiceImpl 中实现歌单收藏和取消收藏功能
- 在 PlaylistDetail.vue 中显示歌单的收藏数和评论数
- 更新数据库模型，在 Singer 实体中添加收藏数和评论数字段

music-houduan/src/main/java/com/test/musichouduan/entity/Singer.java

@@ -48,6 +48,18 @@ public class Singer {
     @JoinColumn(name = "type_id")
     private SingerType type;
 
+    /**
+     * 收藏数
+     */
+    @Column
+    private Integer collectCount;
+
+    /**
+     * 评论数
+     */
+    @Column
+    private Integer commentCount;
+
     /**
      * 创建时间
      */

music-houduan/src/main/java/com/test/musichouduan/service/impl/CommentServiceImpl.java

@@ -10,6 +10,7 @@ import com.test.musichouduan.entity.User;
 import com.test.musichouduan.exception.BusinessException;
 import com.test.musichouduan.repository.CommentRepository;
 import com.test.musichouduan.repository.MusicRepository;
+import com.test.musichouduan.repository.PlaylistRepository;
 import com.test.musichouduan.repository.UserRepository;
 import com.test.musichouduan.service.CommentService;
 import org.springframework.messaging.simp.SimpMessagingTemplate; // 添加导入
@@ -44,6 +45,9 @@ public class CommentServiceImpl implements CommentService {
     @Autowired
     private MusicRepository musicRepository;
 
+    @Autowired
+    private PlaylistRepository playlistRepository;
+
     @Autowired
     private SimpMessagingTemplate messagingTemplate; // 注入 SimpMessagingTemplate
 
@@ -121,6 +125,12 @@ public class CommentServiceImpl implements CommentService {
                     musicRepository.save(music);
                 }
             });
+        } else if (savedComment.getTargetType() == 2) { // 2 代表歌单
+            playlistRepository.findById(savedComment.getTargetId()).ifPresent(playlist -> {
+                long commentCount = commentRepository.countByTargetIdAndTargetType(savedComment.getTargetId(), 2);
+                playlist.setCommentCount((int) commentCount);
+                playlistRepository.save(playlist);
+            });
         }
 
         // 将新评论转换为DTO
@@ -153,6 +163,21 @@ public class CommentServiceImpl implements CommentService {
         // 删除评论
         commentRepository.delete(comment);
 
+        // 更新相关实体的评论数
+        if (comment.getTargetType() == 1) {
+            musicRepository.findById(comment.getTargetId()).ifPresent(music -> {
+                long commentCount = commentRepository.countByTargetIdAndTargetType(comment.getTargetId(), 1);
+                music.setCommentCount((int) commentCount);
+                musicRepository.save(music);
+            });
+        } else if (comment.getTargetType() == 2) {
+            playlistRepository.findById(comment.getTargetId()).ifPresent(playlist -> {
+                long commentCount = commentRepository.countByTargetIdAndTargetType(comment.getTargetId(), 2);
+                playlist.setCommentCount((int) commentCount);
+                playlistRepository.save(playlist);
+            });
+        }
+
         // 如果是父评论，同时删除子评论
         if (comment.getParentId() == null) {
             List<Comment> children = commentRepository.findByParentIdOrderByCreateTimeAsc(id);

music-houduan/src/main/java/com/test/musichouduan/service/impl/PlaylistServiceImpl.java

@@ -275,6 +275,10 @@ public class PlaylistServiceImpl implements PlaylistService {
         // 收藏歌单
         userPlaylistRepository.collectPlaylist(user.getId(), playlist.getId());
 
+        // 更新收藏数
+        playlist.setCollectCount(playlist.getCollectCount() + 1);
+        playlistRepository.save(playlist);
+
         return true;
     }
 
@@ -298,6 +302,10 @@ public class PlaylistServiceImpl implements PlaylistService {
         // 取消收藏歌单
         userPlaylistRepository.uncollectPlaylist(user.getId(), playlist.getId());
 
+        // 更新收藏数
+        playlist.setCollectCount(playlist.getCollectCount() - 1);
+        playlistRepository.save(playlist);
+
         return true;
     }