1 files changed, 20 insertions, 10 deletions
diff --git a/railties/lib/rails/railtie/configurable.rb b/railties/lib/rails/railtie/configurable.rb
index a2eb938c5a..920ab67ff1 100644
--- a/railties/lib/rails/railtie/configurable.rb
+++ b/railties/lib/rails/railtie/configurable.rb
@@ -1,22 +1,32 @@
 module Rails
   class Railtie
     module Configurable
-      def self.included(base)
-        base.extend ClassMethods
-      end
+      extend ActiveSupport::Concern
 
       module ClassMethods
-        def config
-          @config ||= Railtie::Configuration.new
-        end
+        delegate :config, :to => :instance
 
         def inherited(base)
-          raise "You cannot inherit from a Rails::Railtie child"
+          raise "You cannot inherit from a #{self.superclass.name} child"
         end
-      end
 
-      def config
-        self.class.config
+        def instance
+          @instance ||= new
+        end
+
+        def respond_to?(*args)
+          super || instance.respond_to?(*args)
+        end
+
+        def configure(&block)
+          class_eval(&block)
+        end
+
+        protected
+
+        def method_missing(*args, &block)
+          instance.send(*args, &block)
+        end
       end
     end
   end