Add all folders in app/* to the load path

railties/lib/rails/bootstrap.rb

@@ -23,8 +23,8 @@ module Rails
     # the load_once paths.
     initializer :set_autoload_paths do
       require 'active_support/dependencies'
-      ActiveSupport::Dependencies.load_paths = config.load_paths.uniq
-      ActiveSupport::Dependencies.load_once_paths = config.load_once_paths.uniq
+      ActiveSupport::Dependencies.load_paths = expand_load_path(config.load_paths)
+      ActiveSupport::Dependencies.load_once_paths = expand_load_path(config.load_once_paths)
 
       extra = ActiveSupport::Dependencies.load_once_paths - ActiveSupport::Dependencies.load_paths
       unless extra.empty?
@@ -140,7 +140,7 @@ module Rails
       end
     end
 
-    initializer :initialize_notifications do 
+    initializer :initialize_notifications do
       require 'active_support/notifications'
 
       if config.colorize_logging == false
@@ -152,5 +152,10 @@ module Rails
         Rails::Subscriber.dispatch(args)
       end
     end
+
+    private
+      def expand_load_path(load_paths)
+        load_paths.map { |path| Dir.glob(path.to_s) }.flatten.uniq
+      end
   end
 end

railties/lib/rails/configuration.rb

@@ -200,12 +200,7 @@ module Rails
     end
 
     def eager_load_paths
-      @eager_load_paths ||= %w(
-        app/metal
-        app/models
-        app/controllers
-        app/helpers
-      ).map { |dir| "#{root}/#{dir}" }.select { |dir| File.directory?(dir) }
+      @eager_load_paths ||= ["#{root}/app/*"]
     end
 
     def load_paths
@@ -215,20 +210,13 @@ module Rails
         # Add the old mock paths only if the directories exists
         paths.concat(Dir["#{root}/test/mocks/#{Rails.env}"]) if File.exists?("#{root}/test/mocks/#{Rails.env}")
 
-        # Add the app's controller directory
-        paths.concat(Dir["#{root}/app/controllers/"])
-
         # Followed by the standard includes.
         paths.concat %w(
           app
-          app/metal
-          app/models
-          app/controllers
-          app/helpers
-          app/services
+          app/*
           lib
           vendor
-        ).map { |dir| "#{root}/#{dir}" }.select { |dir| File.directory?(dir) }
+        ).map { |dir| "#{root}/#{dir}" }
 
         paths.concat builtin_directories
       end