Create configurable modules and ensure that they are added only on direct children.

1 files changed, 23 insertions, 0 deletions

diff --git a/railties/lib/rails/railtie/configurable.rb b/railties/lib/rails/railtie/configurable.rb
new file mode 100644
index 0000000000..3850efa4a7
--- /dev/null
+++ b/railties/lib/rails/railtie/configurable.rb
@@ -0,0 +1,23 @@
+module Rails
+  class Railtie
+    module Configurable
+      def self.included(base)
+        base.extend ClassMethods
+      end
+
+      module ClassMethods
+        def config
+          @config ||= Configuration.new
+        end
+
+        def inherited(base)
+          raise "You cannot inherit from a Rails::Railtie child"
+        end
+      end
+
+      def config
+        self.class.config
+      end
+    end
+  end
+end