优化删除聊天记录逻辑3

app/enterprise/controller/Im.php

@@ -443,17 +443,19 @@ class Im extends BaseController
         $id = $param['id'];
         $map = ['id' => $id];
         $message = Message::where($map)->find();
-        $data = $message;
         if ($message) {
-            $message->del_user = $this->userInfo['user_id'];
             if ($message['is_group'] == 1) {
                 if ($message['del_user']) {
                     $message->del_user .= ',' . $this->userInfo['user_id'];
+                } else {
+                    $message->del_user = $this->userInfo['user_id'];
                 }
             } else {
-                if ($data['del_user'] > 0) {
+                if ($message['del_user']) {
                     $message->delete();
                     return success(lang('system.delOk'));
+                } else {
+                    $message->del_user = $this->userInfo['user_id'];
                 }
             }
             $message->save();