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Resourcen:

• Episode 203: Routing in Rails 3
• Episode 150: Rails Metal
• The Powerful New Rails Router
• The Rails 3 Router: Rack It Up
• Generic Actions in Rails 3
• Routing Rails Guide
• Full episode source code

Quellcode:

# 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>