Merge pull request #21175 from gringocl/middleware-deprecations

Reference actual classes

activerecord/lib/active_record/railtie.rb

@@ -16,11 +16,11 @@ class Railtie < Rails::Railtie # :nodoc:
     config.app_generators.orm :active_record, :migration => true,
                                               :timestamps => true
 
-    config.app_middleware.insert_after "::ActionDispatch::Callbacks",
-      "ActiveRecord::QueryCache"
+    config.app_middleware.insert_after ::ActionDispatch::Callbacks,
+      ActiveRecord::QueryCache
 
-    config.app_middleware.insert_after "::ActionDispatch::Callbacks",
-      "ActiveRecord::ConnectionAdapters::ConnectionManagement"
+    config.app_middleware.insert_after ::ActionDispatch::Callbacks,
+      ActiveRecord::ConnectionAdapters::ConnectionManagement
 
     config.action_dispatch.rescue_responses.merge!(
       'ActiveRecord::RecordNotFound'   => :not_found,
@@ -78,7 +78,7 @@ class Railtie < Rails::Railtie # :nodoc:
 
     initializer "active_record.migration_error" do
       if config.active_record.delete(:migration_error) == :page_load
-        config.app_middleware.insert_after "::ActionDispatch::Callbacks",
+        config.app_middleware.insert_after ::ActionDispatch::Callbacks,
           "ActiveRecord::Migration::CheckPending"
       end
     end