Railscasts - Rack in Rails 3

#222

Jul 12, 2010

Rack in Rails 3

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.

Tags: rails-3.0 routing performance

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# 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>

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26 comments

1. Inuki Jul 12, 2010 at 01:53

Thx Ryan for this screencast

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2. Paul Koch Jul 12, 2010 at 02:19

Excellent screencast!
Thank you, Ryan!

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3. Hussein Morsy Jul 12, 2010 at 02:42

Thanks Ryan for the advanced topics about rails 3

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4. Tex Jul 12, 2010 at 03:21

Many thanks Ryan !!!

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5. nunu Jul 12, 2010 at 05:35

Aren't there any sponsors for now?

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6. Dinooz Jul 12, 2010 at 06:31

As always awesome screencasts Ryan, thank you, let me ask you something, what would be the approach for caching tecniques in Rails 3?

Keep doing the great job.

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7. James Jul 12, 2010 at 06:51

I started learning Rails about 2 months ago and I would just like to say thanks, your screen casts have been a great help during this time and I look forward to more excellent learning experiences from your site! Thanks!

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8. Andy Jul 12, 2010 at 09:01

How would you do authentication / authorization for embedded apps??

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9. Jim Jul 15, 2010 at 02:21

I haven't tested Rails Metal yet but I know that this would be a good resource when the time comes.

Thanks!

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What is this?

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Thank you for your share!

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12. Dmitry A. Ustalov Jul 26, 2010 at 02:34

Please note that Metal is deprecated and removed since Rails 3.0.0.beta4.

https://rails.lighthouseapp.com/projects/8994/tickets/4889-rails-300beta4-metal-absent

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13. Konstantin Jul 26, 2010 at 16:59

Here is a blog post on how to get Metal-like application enabled in a new Rails3 app:

http://tektastic.com/2010/07/rails3-rack-and-where-did-my-metal-go.html

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Here is a blog post on how to get Metal-like application enabled in a new Rails3

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

match "/processes" => ProcessesApp.action(:index)

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I learned how to embed Sinatra into an app, handle redirects, and improve on Rails Metal.thank you.

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37. Antique Website Designs Aug 27, 2010 at 12:11

The Sinatra example no longer works in the Rails 3 rc2 release. Any ideas on how to get this operational? I suspect that either the lib directory is not being loaded or support for Metal has been removed as Konstantin's article.
~statique

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38. Antique Website Design Aug 27, 2010 at 12:28

As it turns out, the Sinatra example is not operational because Rails 3.0.0.rc2 does not load the lib directory. Austen Conrad posted an article with a fix to this problem by adding His full article is here: http://blog.arconrad.com/?p=1282

An alternative to wildcard loading the lib, one could create an initializer to load the app specifically.
~statique

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Rack in Rails 3

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