1 files changed, 42 insertions, 7 deletions
diff --git a/railties/lib/rails/application.rb b/railties/lib/rails/application.rb
index a3b3a56bc8..85ae8cbbb1 100644
--- a/railties/lib/rails/application.rb
+++ b/railties/lib/rails/application.rb
@@ -27,7 +27,7 @@ module Rails
   # Besides providing the same configuration as Rails::Engine and Rails::Railtie,
   # the application object has several specific configurations, for example
   # "allow_concurrency", "cache_classes", "consider_all_requests_local", "filter_parameters",
-  # "logger", "metals", "reload_engines", "reload_plugins" and so forth.
+  # "logger", "reload_engines", "reload_plugins" and so forth.
   #
   # Check Rails::Application::Configuration to see them all.
   #
@@ -36,17 +36,15 @@ module Rails
   # The application object is also responsible for holding the routes and reloading routes
   # whenever the files change in development.
   #
-  # == Middlewares and metals
+  # == Middlewares
   #
-  # The Application is also responsible for building the middleware stack and setting up
-  # both application and engines metals.
+  # The Application is also responsible for building the middleware stack.
   #
   class Application < Engine
     autoload :Bootstrap,      'rails/application/bootstrap'
     autoload :Configurable,   'rails/application/configurable'
     autoload :Configuration,  'rails/application/configuration'
     autoload :Finisher,       'rails/application/finisher'
-    autoload :MetalLoader,    'rails/application/metal_loader'
     autoload :Railties,       'rails/application/railties'
     autoload :RoutesReloader, 'rails/application/routes_reloader'
 
@@ -69,6 +67,7 @@ module Rails
         raise "You cannot have more than one Rails::Application" if Rails.application
         super
         Rails.application = base.instance
+        Rails.application.add_lib_to_load_paths!
         ActiveSupport.run_load_hooks(:before_configuration, base.instance)
       end
 
@@ -83,13 +82,23 @@ module Rails
       end
     end
 
-    delegate :middleware, :metal_loader, :to => :config
+    delegate :middleware, :to => :config
+
+    def add_lib_to_load_paths!
+      path = config.root.join('lib').to_s
+      $LOAD_PATH.unshift(path) if File.exists?(path)
+    end
 
     def require_environment!
       environment = paths.config.environment.to_a.first
       require environment if environment
     end
 
+    def eager_load!
+      railties.all(&:eager_load!)
+      super
+    end
+
     def routes
       @routes ||= ActionDispatch::Routing::RouteSet.new
     end
@@ -126,7 +135,10 @@ module Rails
     end
 
     def app
-      @app ||= config.middleware.build(routes)
+      @app ||= begin
+        config.middleware = config.middleware.merge_into(default_middleware_stack)
+        config.middleware.build(routes)
+      end
     end
 
     def call(env)
@@ -150,6 +162,29 @@ module Rails
 
   protected
 
+    def default_middleware_stack
+      ActionDispatch::MiddlewareStack.new.tap do |middleware|
+        middleware.use ::ActionDispatch::Static, paths.public.to_a.first if config.serve_static_assets
+        middleware.use ::Rack::Lock if !config.allow_concurrency
+        middleware.use ::Rack::Runtime
+        middleware.use ::Rails::Rack::Logger
+        middleware.use ::ActionDispatch::ShowExceptions, config.consider_all_requests_local if config.action_dispatch.show_exceptions
+        middleware.use ::ActionDispatch::RemoteIp, config.action_dispatch.ip_spoofing_check, config.action_dispatch.trusted_proxies
+        middleware.use ::Rack::Sendfile, config.action_dispatch.x_sendfile_header
+        middleware.use ::ActionDispatch::Callbacks, !config.cache_classes
+        middleware.use ::ActionDispatch::Cookies
+
+        if config.session_store
+          middleware.use config.session_store, config.session_options
+          middleware.use ::ActionDispatch::Flash
+        end
+
+        middleware.use ::ActionDispatch::ParamsParser
+        middleware.use ::Rack::MethodOverride
+        middleware.use ::ActionDispatch::Head
+      end
+    end
+
     def initialize_tasks
       require "rails/tasks"
       task :environment do