Deprecate generators in Railties. You should use app_generators instead.

railties/lib/rails/engine/configuration.rb

@@ -4,16 +4,38 @@ module Rails
   class Engine
     class Configuration < ::Rails::Railtie::Configuration
       attr_reader :root
-      attr_writer :eager_load_paths, :autoload_once_paths, :autoload_paths
-      attr_accessor :middleware, :plugins, :asset_path
+      attr_writer :middleware, :eager_load_paths, :autoload_once_paths, :autoload_paths
+      attr_accessor :plugins, :asset_path
 
       def initialize(root=nil)
         super()
         @root = root
-        @middleware = Rails::Configuration::MiddlewareStackProxy.new
         @helpers_paths = []
       end
 
+      # Returns the middleware stack for the engine.
+      def middleware
+        @middleware ||= Rails::Configuration::MiddlewareStackProxy.new
+      end
+
+      # Holds generators configuration:
+      #
+      #   config.generators do |g|
+      #     g.orm             :datamapper, :migration => true
+      #     g.template_engine :haml
+      #     g.test_framework  :rspec
+      #   end
+      #
+      # If you want to disable color in console, do:
+      #
+      #   config.generators.colorize_logging = false
+      #
+      def generators #:nodoc
+        @generators ||= Rails::Configuration::Generators.new
+        yield(@generators) if block_given?
+        @generators
+      end
+
       def paths
         @paths ||= begin
           paths = Rails::Paths::Root.new(@root)

railties/lib/rails/railtie.rb

@@ -83,7 +83,7 @@ module Rails
   #
   #   class MyRailtie < Rails::Railtie
   #     # Customize the ORM
-  #     config.generators.orm :my_railtie_orm
+  #     config.app_generators.orm :my_railtie_orm
   #
   #     # Add a to_prepare block which is executed once in production
   #     # and before each request in development

railties/lib/rails/railtie/configuration.rb

@@ -5,7 +5,6 @@ module Rails
     class Configuration
       def initialize
         @@options ||= {}
-        @@static_asset_paths = ActiveSupport::OrderedHash.new
       end
 
       # This allows you to modify the application's middlewares from Engines.
@@ -23,32 +22,13 @@ module Rails
       # application overwrites them.
       def app_generators
         @@app_generators ||= Rails::Configuration::Generators.new
-        if block_given?
-          yield @@app_generators
-        else
-          @@app_generators
-        end
+        yield(@@app_generators) if block_given?
+        @@app_generators
       end
 
-      # Holds generators configuration:
-      #
-      #   config.generators do |g|
-      #     g.orm             :datamapper, :migration => true
-      #     g.template_engine :haml
-      #     g.test_framework  :rspec
-      #   end
-      #
-      # If you want to disable color in console, do:
-      #
-      #   config.generators.colorize_logging = false
-      #
-      def generators
-        @generators ||= Rails::Configuration::Generators.new
-        if block_given?
-          yield @generators
-        else
-          @generators
-        end
+      def generators(&block) #:nodoc
+        ActiveSupport::Deprecation.warn "config.generators is deprecated. Please use config.app_generators instead."
+        app_generators(&block)
       end
 
       def before_configuration(&block)
@@ -83,7 +63,7 @@ module Rails
       # with associated public folders, like:
       # { "/" => "/app/public", "/my_engine" => "app/engines/my_engine/public" }
       def static_asset_paths
-        @@static_asset_paths
+        @@static_asset_paths ||= ActiveSupport::OrderedHash.new
       end
 
     private