fix(community): persist post liked status in MySQL and local storage to prevent state loss on page switch

server/src/db/mysql.ts

@@ -313,7 +313,20 @@ export async function initDatabase(): Promise<void> {
       ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
     `);
 
-    // 16. 首页轮播图运营配置表
+    // 16. 友圈动态用户点赞明细表 (用于持久化用户点赞状态并防重)
+    await conn.query(`
+      CREATE TABLE IF NOT EXISTS post_likes (
+        id VARCHAR(64) PRIMARY KEY,
+        post_id VARCHAR(64) NOT NULL,
+        user_id INT NOT NULL,
+        created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+        UNIQUE KEY uq_post_user (post_id, user_id),
+        INDEX idx_post_likes_user (user_id),
+        INDEX idx_post_likes_post (post_id)
+      ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+    `);
+
+    // 17. 首页轮播图运营配置表
     await conn.query(`
       CREATE TABLE IF NOT EXISTS banners (
         id INT PRIMARY KEY AUTO_INCREMENT,

server/src/db/repository.ts

@@ -2215,7 +2215,19 @@ export class MysqlRepository {
 
 
   // 友圈动态相关
-  async getPosts(category?: string, keyword?: string, status?: string): Promise<any[]> {
+  async getPosts(category?: string, keyword?: string, status?: string, userId?: number): Promise<any[]> {
+    const currentUserId = userId !== undefined ? Number(userId) : 1001;
+    const likedPostIdSet = new Set<string>();
+    try {
+      const [likedRows]: any = await pool.query(
+        'SELECT post_id FROM post_likes WHERE user_id = ?',
+        [currentUserId]
+      );
+      if (Array.isArray(likedRows)) {
+        likedRows.forEach((row: any) => likedPostIdSet.add(String(row.post_id)));
+      }
+    } catch (_) {}
+
     let sql = `
       SELECT 
         id, user_id as userId, author, avatar, tag, tag_type as tagType,
@@ -2257,6 +2269,7 @@ export class MysqlRepository {
 
       return {
         ...r,
+        liked: likedPostIdSet.has(String(r.id)),
         isTop: Boolean(r.isTop),
         status: r.status || '正常',
         topics: topicsArr,
@@ -2354,10 +2367,41 @@ export class MysqlRepository {
     };
   }
 
-  async likePost(id: string): Promise<any> {
-    await pool.query('UPDATE posts SET likes = likes + 1 WHERE id = ?', [id]);
+  async likePost(id: string, userId: number = 1001, action?: 'like' | 'unlike'): Promise<any> {
+    const currentUserId = Number(userId) || 1001;
+    let liked = false;
+    try {
+      const [existing]: any = await pool.query(
+        'SELECT id FROM post_likes WHERE post_id = ? AND user_id = ?',
+        [id, currentUserId]
+      );
+      const isCurrentlyLiked = existing && existing.length > 0;
+      const shouldLike = action ? action === 'like' : !isCurrentlyLiked;
+
+      if (!shouldLike) {
+        if (isCurrentlyLiked) {
+          await pool.query('DELETE FROM post_likes WHERE post_id = ? AND user_id = ?', [id, currentUserId]);
+          await pool.query('UPDATE posts SET likes = GREATEST(0, likes - 1) WHERE id = ?', [id]);
+        }
+        liked = false;
+      } else {
+        if (!isCurrentlyLiked) {
+          const likeId = `like_${Date.now()}_${Math.floor(100 + Math.random() * 900)}`;
+          await pool.query(
+            'INSERT IGNORE INTO post_likes (id, post_id, user_id, created_at) VALUES (?, ?, ?, NOW())',
+            [likeId, id, currentUserId]
+          );
+          await pool.query('UPDATE posts SET likes = likes + 1 WHERE id = ?', [id]);
+        }
+        liked = true;
+      }
+    } catch (_) {
+      // 容错兜底递增
+      await pool.query('UPDATE posts SET likes = likes + 1 WHERE id = ?', [id]);
+      liked = true;
+    }
     const [rows]: any = await pool.query('SELECT likes FROM posts WHERE id = ?', [id]);
-    return { id, likes: rows[0]?.likes || 1 };
+    return { id, likes: rows[0]?.likes || 0, liked };
   }
 
   // 13. 订单评价与评分业务

server/src/index.ts

@@ -1694,7 +1694,8 @@ app.get('/api/users/:id/finance-records', async (req: Request, res: Response) =>
 app.get('/api/posts', async (req: Request, res: Response) => {
   try {
     const category = req.query.category ? String(req.query.category) : undefined;
-    const posts = await repo.getPosts(category);
+    const userId = Number(req.query.userId || req.headers['x-user-id']) || 1001;
+    const posts = await repo.getPosts(category, undefined, '正常', userId);
     res.json({
       code: 20000,
       data: posts
@@ -1804,11 +1805,13 @@ app.post('/api/posts', async (req: Request, res: Response) => {
 
 app.post('/api/posts/:id/like', async (req: Request, res: Response) => {
   try {
-    const result = await repo.likePost(String(req.params.id));
+    const userId = Number(req.body?.userId || req.query.userId || req.headers['x-user-id']) || 1001;
+    const action = req.body?.action as 'like' | 'unlike' | undefined;
+    const result = await repo.likePost(String(req.params.id), userId, action);
     res.json({
       code: 20000,
       data: result,
-      message: '点赞成功'
+      message: result.liked ? '点赞成功' : '已取消点赞'
     });
   } catch (err: any) {
     res.status(400).json({ code: 40000, message: err.message });