NOTE: If you're using Ruby 1.8.x please use the 1.x series of rack-debug

Install

$ gem install rack-debug

Rails

config/environments/development.rb

config.gem 'rack-debug' config.middleware.use 'Rack::Debug'

RAILS_ROOT/Rakefile

require 'rack-debug/tasks'

Middleware

add a use line to your builder

require 'rack/debug' Rack::Builder.new do use Rack::Debug run MyApp.new end

can optionally specify where to put the sockets

use Rack::Debug, :socket_path => '/tmp/rack-debug'

Rakefile

require 'rack-debug/tasks'

Add breakpoints to your code

@user = User.find(params[:id]) debugger render :show

Debugging:

run the rake task,

$ rake debug Connected.

refresh a page in your browser, your app will break at debugger statements

(rdb:1) p @user #<User id: 1, name: "David Dollar", email: "ddollar@gmail.com", created_at: "...", updated_at: "...">

can specify the socket path

SOCKET_PATH=/tmp/rack-debug rake debug

Meta:

Author/Maintainer: David Dollar

Patches contributed by: Bart Teeuwisse

Thanks to:

Rack::Bug for a good example of Rack middleware in Rails Ben Scofield for making me want to build some Rack middleware