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

1 files changed, 24 insertions, 0 deletions

diff --git a/railties/lib/rails/engine/configurable.rb b/railties/lib/rails/engine/configurable.rb
new file mode 100644
index 0000000000..fb420e8a12
--- /dev/null
+++ b/railties/lib/rails/engine/configurable.rb
@@ -0,0 +1,24 @@
+module Rails
+  class Engine
+    module Configurable
+      def self.included(base)
+        base.extend ClassMethods
+        base.delegate :middleware, :root, :paths, :to => :config
+      end
+
+      module ClassMethods
+        def config
+          @config ||= Configuration.new(find_root_with_flag("lib"))
+        end
+
+        def inherited(base)
+          raise "You cannot inherit from a Rails::Engine child"
+        end
+      end
+
+      def config
+        self.class.config
+      end
+    end
+  end
+end
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