群聊新加入好友可以看到群上一条消息问题

app/enterprise/model/Group.php

@@ -16,7 +16,7 @@ class Group extends BaseModel
    public static function getMyGroup($map){
       return Db::name('group_user')
       ->alias('gu')
-      ->field('gr.group_id,gr.avatar,gr.name as displayName,gu.unread,gr.name_py,gr.owner_id,gr.notice,gu.role,gu.is_notice,gu.is_top,gr.setting')
+      ->field('gr.group_id,gr.avatar,gr.name as displayName,gu.unread,gr.name_py,gr.owner_id,gr.notice,gu.role,gu.is_notice,gu.is_top,gr.setting,gu.create_time as gu_create_time')
       ->join('group gr','gu.group_id=gr.group_id','left')
       ->where($map)
       ->select();

app/enterprise/model/User.php

@@ -196,6 +196,9 @@ class User extends BaseModel
             $group[$k]['is_at'] = 0;
             if ($getGroupLastMsg) {
                foreach ($getGroupLastMsg as $key=>$val) {
+                  if ($val['lastSendTime'] < $v['gu_create_time']) {
+                      continue;
+                  }
                   if ($val['to_user'] == $v['group_id']) {
                      $group[$k]['type'] =$val['type'];
                      $group[$k]['lastContent'] = str_encipher($val['lastContent'],false);