1 业务消息重 @用户 消息去重

@@ -267,8 +267,12 @@ func (l *MiniBusinessLogic) createMessage(
 	at []int64) (err error) {
 
 	var userToken = contextdata.GetUserTokenFromCtx(l.ctx)
-	// 评论中携带了 @其他用户
+	var dupMap = make(map[int64]int64, 0)
+	// 评论中携带了 @用户
 	for i := range at {
+		if _, ok := dupMap[at[i]]; ok { /* ID去重 */
+			// do nothing ...
+		} else {
 			var msg = &domain.MessageBusiness{
 				Type:            msgType,
 				OptType:         optType,
@@ -283,6 +287,9 @@ func (l *MiniBusinessLogic) createMessage(
 			if err != nil {
 				return err
 			}
+			dupMap[at[i]] = at[i]
+		}
+
 	}
 	return nil
 }