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Rack in Rails 3

#222 Rack in Rails 3

Jul 12, 2010 | 8 minutes | Rails 3.0, Routing, Performance, Rack
The router in Rails 3 is fully compatible with Rack. Learn how to embed Sinatra into an app, handle redirects, and improve on Rails Metal.
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Resources

routes.rb 
root :to => "home#index"
root :to => HomeController.action(:index)
root :to => HomeApp

match "/about" => redirect("/aboutus")
match "/aboutus" => "info#about"

resources :products
match "/p/:id" => redirect("/products/%{id}")

match "/processes" => ProcessesApp.action(:index)
Gemfile 
gem "sinatra"
lib/home_app.rb 
class HomeApp < Sinatra::Base
  get "/" do
    "Hello from Sinatra!"
  end
end
lib/processes_app.rb 
class ProcessesApp < ActionController::Metal
  include ActionController::Rendering
  
  append_view_path "#{Rails.root}/app/views"
  
  def index
    @processes = `ps -axcr -o "pid,pcpu,pmem,time,comm"`
    render
  end
end
app/views/processes_app/index.html.erb 
<h1>Processes</h1>
<pre><%= @processes %></pre>