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;
     }
 

music-qianduan/src/views/PlaylistDetail.vue

@@ -141,6 +141,12 @@ const toggleCollect = async () => {
     const res = await toggleCollectPlaylist(playlistId.value)
     if (res.code === 200) {
       isCollected.value = !isCollected.value
+      // 更新收藏数
+      if (isCollected.value) {
+        playlist.value.collectCount++
+      } else {
+        playlist.value.collectCount--
+      }
       ElMessage.success(isCollected.value ? '收藏成功' : '已取消收藏')
     } else {
       ElMessage.error(res.message || '操作失败')
@@ -163,6 +169,8 @@ const deleteComment = async (commentId) => {
     const res = await apiDeleteComment(commentId)
     if (res.code === 200) {
       comments.value = comments.value.filter(c => c.id !== commentId)
+      // 更新评论数
+      playlist.value.commentCount--
       ElMessage.success('评论已删除')
     } else {
       ElMessage.error(res.message || '删除失败')
@@ -256,6 +264,8 @@ const submitComment = async (isReply = false) => {
         commentContent.value = ''
       }
       ElMessage.success('评论已发送')
+      // 更新评论数
+      playlist.value.commentCount++
     } else {
       ElMessage.error(res.message || '评论失败')
     }
@@ -388,6 +398,11 @@ onUnmounted(() => {
           </div>
           <div class="playlist-time">创建时间：{{ playlist.createTime }}</div>
           <div class="playlist-count">播放次数：{{ formatPlayCount(playlist.playCount) }}</div>
+          <div class="playlist-stats">
+            <span>收藏数：{{ playlist.collectCount }}</span>
+            <el-divider direction="vertical" />
+            <span>评论数：{{ playlist.commentCount }}</span>
+          </div>
           <div class="playlist-desc">{{ playlist.description }}</div>
 
           <div class="playlist-actions">
@@ -488,7 +503,7 @@ onUnmounted(() => {
           ></el-empty>
         </el-tab-pane>
 
-        <el-tab-pane label="评论">
+        <el-tab-pane :label="`评论(${playlist.commentCount || 0})`">
           <!-- 评论输入框 -->
           <div class="comment-input">
             <el-input