ActiveRecord middlewares should be inserted before AD::Cascade [#4493 state:resolved].

activerecord/lib/active_record/railtie.rb

@@ -61,13 +61,8 @@ module ActiveRecord
     # Setup database middleware after initializers have run
     initializer "active_record.initialize_database_middleware", :after => "action_controller.set_configs" do |app|
       middleware = app.config.middleware
-      if middleware.include?("ActiveRecord::SessionStore")
-        middleware.insert_before "ActiveRecord::SessionStore", ActiveRecord::ConnectionAdapters::ConnectionManagement
-        middleware.insert_before "ActiveRecord::SessionStore", ActiveRecord::QueryCache
-      else
-        middleware.use ActiveRecord::ConnectionAdapters::ConnectionManagement
-        middleware.use ActiveRecord::QueryCache
-      end
+      middleware.insert_after "::ActionDispatch::Callbacks", ActiveRecord::QueryCache
+      middleware.insert_after "::ActionDispatch::Callbacks", ActiveRecord::ConnectionAdapters::ConnectionManagement
     end
 
     initializer "active_record.set_dispatch_hooks", :before => :set_clear_dependencies_hook do |app|

railties/lib/rails/application/configuration.rb

@@ -143,7 +143,7 @@ module Rails
           middleware.use('::Rack::Runtime')
           middleware.use('::Rails::Rack::Logger')
           middleware.use('::ActionDispatch::ShowExceptions', lambda { consider_all_requests_local }, :if => lambda { action_dispatch.show_exceptions })
-          middleware.use("::ActionDispatch::RemoteIp", lambda { action_dispatch.ip_spoofing_check }, lambda { action_dispatch.trusted_proxies })
+          middleware.use('::ActionDispatch::RemoteIp', lambda { action_dispatch.ip_spoofing_check }, lambda { action_dispatch.trusted_proxies })
           middleware.use('::Rack::Sendfile', lambda { action_dispatch.x_sendfile_header })
           middleware.use('::ActionDispatch::Callbacks', lambda { !cache_classes })
           middleware.use('::ActionDispatch::Cookies')

railties/test/application/middleware_test.rb

@@ -27,14 +27,14 @@ module ApplicationTests
         "ActionDispatch::RemoteIp",
         "Rack::Sendfile",
         "ActionDispatch::Callbacks",
+        "ActiveRecord::ConnectionAdapters::ConnectionManagement",
+        "ActiveRecord::QueryCache",
         "ActionDispatch::Cookies",
         "ActionDispatch::Session::CookieStore",
         "ActionDispatch::Flash",
         "ActionDispatch::ParamsParser",
         "Rack::MethodOverride",
-        "ActionDispatch::Head",
-        "ActiveRecord::ConnectionAdapters::ConnectionManagement",
-        "ActiveRecord::QueryCache"
+        "ActionDispatch::Head"
       ], middleware
     end