diff --git a/spec/wulin_app/app/controllers/addresses_controller.rb b/spec/wulin_app/app/controllers/addresses_controller.rb
index 8fc8315f..1d0dd600 100644
--- a/spec/wulin_app/app/controllers/addresses_controller.rb
+++ b/spec/wulin_app/app/controllers/addresses_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddressesController < WulinMaster::ScreenController
   controller_for_screen AddressScreen
-end
\ No newline at end of file
+end
diff --git a/spec/wulin_app/app/controllers/clients_controller.rb b/spec/wulin_app/app/controllers/clients_controller.rb
index 2043e7f6..0b20c446 100644
--- a/spec/wulin_app/app/controllers/clients_controller.rb
+++ b/spec/wulin_app/app/controllers/clients_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ClientsController < WulinMaster::ScreenController
   controller_for_screen ClientScreen
-end
\ No newline at end of file
+end
diff --git a/spec/wulin_app/app/controllers/courses_controller.rb b/spec/wulin_app/app/controllers/courses_controller.rb
index e023b634..e7497e25 100644
--- a/spec/wulin_app/app/controllers/courses_controller.rb
+++ b/spec/wulin_app/app/controllers/courses_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CoursesController < WulinMaster::ScreenController
   controller_for_screen CourseScreen
-end
\ No newline at end of file
+end
diff --git a/spec/wulin_app/app/controllers/trainings_controller.rb b/spec/wulin_app/app/controllers/trainings_controller.rb
index 99b7b1b4..ba76bdf9 100644
--- a/spec/wulin_app/app/controllers/trainings_controller.rb
+++ b/spec/wulin_app/app/controllers/trainings_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class TrainingsController < WulinMaster::ScreenController
   controller_for_screen TrainingScreen
-end
\ No newline at end of file
+end
diff --git a/spec/wulin_app/app/grids/address_grid.rb b/spec/wulin_app/app/grids/address_grid.rb
index c3090fad..31be20f6 100644
--- a/spec/wulin_app/app/grids/address_grid.rb
+++ b/spec/wulin_app/app/grids/address_grid.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddressGrid < WulinMaster::Grid
   title 'Addresses'
 
diff --git a/spec/wulin_app/app/grids/client_grid.rb b/spec/wulin_app/app/grids/client_grid.rb
index c606fcde..b22d9e5e 100644
--- a/spec/wulin_app/app/grids/client_grid.rb
+++ b/spec/wulin_app/app/grids/client_grid.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ClientGrid < WulinMaster::Grid
   title 'Clients'
 
@@ -8,4 +10,4 @@ class ClientGrid < WulinMaster::Grid
   column :name
 
   load_default_actions # Add default toolbar items for this grid
-end
\ No newline at end of file
+end
diff --git a/spec/wulin_app/app/grids/course_grid.rb b/spec/wulin_app/app/grids/course_grid.rb
index 059a7919..69404eee 100644
--- a/spec/wulin_app/app/grids/course_grid.rb
+++ b/spec/wulin_app/app/grids/course_grid.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CourseGrid < WulinMaster::Grid
   title 'Courses'
 
@@ -9,4 +11,4 @@ class CourseGrid < WulinMaster::Grid
   column :training_id
 
   load_default_actions # Add default toolbar items for this grid
-end
\ No newline at end of file
+end
diff --git a/spec/wulin_app/app/grids/training_grid.rb b/spec/wulin_app/app/grids/training_grid.rb
index 7e81aa9a..dd8d1340 100644
--- a/spec/wulin_app/app/grids/training_grid.rb
+++ b/spec/wulin_app/app/grids/training_grid.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class TrainingGrid < WulinMaster::Grid
   title 'Trainings'
 
@@ -9,4 +11,4 @@ class TrainingGrid < WulinMaster::Grid
   column :teacher_id
 
   load_default_actions # Add default toolbar items for this grid
-end
\ No newline at end of file
+end
diff --git a/spec/wulin_app/app/screens/address_screen.rb b/spec/wulin_app/app/screens/address_screen.rb
index 76988d7f..fcab8211 100644
--- a/spec/wulin_app/app/screens/address_screen.rb
+++ b/spec/wulin_app/app/screens/address_screen.rb
@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 class AddressScreen < WulinMaster::Screen
   title 'Addresses'
 
   path '/addresses'
 
   grid AddressGrid
-end
\ No newline at end of file
+end
diff --git a/spec/wulin_app/app/screens/client_screen.rb b/spec/wulin_app/app/screens/client_screen.rb
index ed051e68..2ffa3105 100644
--- a/spec/wulin_app/app/screens/client_screen.rb
+++ b/spec/wulin_app/app/screens/client_screen.rb
@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 class ClientScreen < WulinMaster::Screen
   title 'Clients'
 
   path '/clients'
 
   grid ClientGrid
-end
\ No newline at end of file
+end
diff --git a/spec/wulin_app/app/screens/course_screen.rb b/spec/wulin_app/app/screens/course_screen.rb
index 18606726..e2d28f18 100644
--- a/spec/wulin_app/app/screens/course_screen.rb
+++ b/spec/wulin_app/app/screens/course_screen.rb
@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 class CourseScreen < WulinMaster::Screen
   title 'Courses'
 
   path '/courses'
 
   grid CourseGrid
-end
\ No newline at end of file
+end
diff --git a/spec/wulin_app/app/screens/training_screen.rb b/spec/wulin_app/app/screens/training_screen.rb
index 664463ba..451f5f41 100644
--- a/spec/wulin_app/app/screens/training_screen.rb
+++ b/spec/wulin_app/app/screens/training_screen.rb
@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 class TrainingScreen < WulinMaster::Screen
   title 'Trainings'
 
   path '/trainings'
 
   grid TrainingGrid
-end
\ No newline at end of file
+end