fix

app/services/cache/v2/user_date_rank_service.rb

@@ -16,15 +16,15 @@ class Cache::V2::UserDateRankService < ApplicationService
   end
 
   def read_rank
-    user_rank unless @user_id.nil?
+    user_rank unless @user_id.blank?
   end
 
   def read_statistic
-    user_statistic unless @user_id.nil?
+    user_statistic unless @user_id.blank?
   end
 
   def call 
-    set_user_rank unless @user_id.nil?
+    set_user_rank unless @user_id.blank?
   end
 
   private