1 files changed, 31 insertions, 0 deletions
diff --git a/railties/lib/rails/application/railties.rb b/railties/lib/rails/application/railties.rb
new file mode 100644
index 0000000000..b3e6693f89
--- /dev/null
+++ b/railties/lib/rails/application/railties.rb
@@ -0,0 +1,31 @@
+module Rails
+  class Application
+    class Railties
+      # TODO Write tests for this behavior extracted from Application
+      def initialize(config)
+        @config = config
+      end
+
+      def all(&block)
+        @all ||= railties + engines + plugins
+        @all.each(&block) if block
+        @all
+      end
+
+      def railties
+        @railties ||= ::Rails::Railtie.subclasses.map(&:new)
+      end
+
+      def engines
+        @engines ||= ::Rails::Engine.subclasses.map(&:new)
+      end
+
+      def plugins
+        @plugins ||= begin
+          plugin_names = (@config.plugins || [:all]).map { |p| p.to_sym }
+          Plugin.all(plugin_names, @config.paths.vendor.plugins)
+        end
+      end
+    end
+  end
+end
+\ No newline at end of file