Removing Metal from Rails 3.

If you have existing Metals, you have a few options:
* if your metal behaves like a middleware, add it to the
  middleware stack via config.middleware.use. You can use
  methods on the middleware stack to control exactly where
  it should go
* if it behaves like a Rack endpoint, you can link to it
  in the router. This will result in more optimal routing
  time, and allows you to remove code in your endpoint
  that matches specific URLs in favor of the more powerful
  handling in the router itself.

For the future, you can use ActionController::Metal to get
a very fast controller with the ability to opt-in to specific
controller features without paying the penalty of the full
controller stack.

Since Rails 3 is closer to Rack, the Metal abstraction is
no longer needed.

1 files changed, 1 insertions, 6 deletions

diff --git a/railties/lib/rails/engine.rb b/railties/lib/rails/engine.rb
index b44755820c..cdb00a4eff 100644
--- a/railties/lib/rails/engine.rb
+++ b/railties/lib/rails/engine.rb
@@ -25,7 +25,7 @@ module Rails
   #   end
   #
   # Then ensure that this file is loaded at the top of your config/application.rb (or in
-  # your Gemfile) and it will automatically load models, controllers, helpers and metals
+  # your Gemfile) and it will automatically load models, controllers and helpers
   # inside app, load routes at "config/routes.rb", load locales at "config/locales/*",
   # load tasks at "lib/tasks/*".
   #
@@ -73,7 +73,6 @@ module Rails
   #     paths.app.controllers     = "app/controllers"
   #     paths.app.helpers         = "app/helpers"
   #     paths.app.models          = "app/models"
-  #     paths.app.metals          = "app/metal"
   #     paths.app.views           = "app/views"
   #     paths.lib                 = "lib"
   #     paths.lib.tasks           = "lib/tasks"
@@ -202,10 +201,6 @@ module Rails
       end
     end
 
-    initializer :add_metals do |app|
-      app.metal_loader.paths.unshift(*paths.app.metals.to_a)
-    end
-
     initializer :load_config_initializers do
       paths.config.initializers.to_a.sort.each do |initializer|
         load(initializer)