diff --git a/webapp/controller/DailySelectionController.class.php b/webapp/controller/DailySelectionController.class.php
index ac3b678c..17f8e8e0 100644
--- a/webapp/controller/DailySelectionController.class.php
+++ b/webapp/controller/DailySelectionController.class.php
@@ -257,8 +257,7 @@ class DailySelectionController extends BaseAuthedController {
 
     private function load()
     {
-        $rawData = myself()->_getSelfRedis()->get(
-            DAILY_SELECTION_KEY . myself()->_getAccountId());
+        $rawData = myself()->_getSelfRedis()->get($this->getRedisKey());
         if (empty($rawData)) {
             $this->internalRefresh(false);
             $this->save();
@@ -272,12 +271,18 @@ class DailySelectionController extends BaseAuthedController {
         $remainSec = 3600 * 24 - (myself()->_getNowTime() - myself()->_getNowDaySeconds());
         $remainSec = max(0, $remainSec);
         myself()->_getSelfRedis()->set(
-            DAILY_SELECTION_KEY . myself()->_getAccountId(),
+            $this->getRedisKey(),
             json_encode($this->data)
         );
         myself()->_getSelfRedis()->pexpire(
-            DAILY_SELECTION_KEY . myself()->_getAccountId(),
+            $this->getRedisKey(),
             $remainSec * 1000);
     }
 
+    private function getRedisKey()
+    {
+        $key = DAILY_SELECTION_KEY . myself()->_getAccountId();
+        return $key;
+    }
+
 }