Setup ActiveRecord QueryCache middleware in the initializer

actionpack/lib/action_controller/middlewares.rb

@@ -4,8 +4,6 @@
 
 use "ActionController::Failsafe"
 
-use "ActiveRecord::QueryCache", :if => lambda { defined?(ActiveRecord) }
-
 ["ActionController::Session::CookieStore",
  "ActionController::Session::MemCacheStore",
  "ActiveRecord::SessionStore"].each do |store|
@@ -18,6 +16,6 @@
     )
 end
 
-use ActionController::RewindableInput
-use ActionController::ParamsParser
-use Rack::MethodOverride
+use "ActionController::RewindableInput"
+use "ActionController::ParamsParser"
+use "Rack::MethodOverride"

railties/lib/initializer.rb

@@ -408,6 +408,7 @@ def initialize_database
       if configuration.frameworks.include?(:active_record)
         ActiveRecord::Base.configurations = configuration.database_configuration
         ActiveRecord::Base.establish_connection
+        configuration.middleware.use ActiveRecord::QueryCache
       end
     end