diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index c1c25151..435c71fc 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -132,16 +132,6 @@ class ApplicationController < ActionController::Base
     end
   end
 
-  DCODES = %W(2 3 4 5 6 7 8 9 a b c f e f g h i j k l m n o p q r s t u v w x y z)
-  # 随机生成字符
-  def generates_identifier(container, num)
-    code = DCODES.sample(num).join
-    while container.exists?(identifier: code) do
-      code = DCODES.sample(num).join
-    end
-    code
-  end
-
   def ec_public_auth major_school
     unless User.current.admin? || major_school.template_major || major_school.school.users.where(:id => User.current.id).count > 0 ||
         major_school.ec_major_school_users.where(:user_id => User.current.id).count > 0 ||
diff --git a/app/services/games_service.rb b/app/services/games_service.rb
index 91645e84..b858abe6 100644
--- a/app/services/games_service.rb
+++ b/app/services/games_service.rb
@@ -1039,6 +1039,15 @@ class GamesService
   end
 
   private
+  DCODES = %W(2 3 4 5 6 7 8 9 a b c f e f g h i j k l m n o p q r s t u v w x y z)
+  # 随机生成字符
+  def generates_identifier(container, num)
+    code = DCODES.sample(num).join
+    while container.exists?(identifier: code) do
+      code = DCODES.sample(num).join
+    end
+    code
+  end
 
   def format_answer_list games
     user_info = []