Rack::Flash

In the past when I’ve needed Rails-like session flash in a Sinatra app, I had to hand roll my own (which, admittedly, is pretty fun) and add it as a helper. But now it’s a much better idea to use Rack::Flash.

First, install Rack::Flash if you don’t have it already:

$ sudo gem install nakajima-rack-flash

And a quick demo app:

require 'rubygems'
require 'sinatra'
require 'rack-flash'

use Rack::Session::Cookie
use Rack::Flash

get '/' do
  flash[:notice] = "Hello from rack-flash"
  redirect '/show-flash'
end

get '/show-flash' do
  flash[:notice]
end

Notice that if you reload ‘/show-flash’ the session flash message disappears.

For more information on Rack::Flash:

* http://github.com/nakajima/rack-flash/
* http://blog.admoolabs.com/2009/03/20/rackflash/

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