Patch the Call to rack_builder
Treeder forked the original Rack::Flash and patched its issues, see https://github.com/treeder/rack-flash
However, when not using Sinatra, the code still won't work. This patches that in the Patch_rack_builder_call branch.
Below is the original README.md
Rack Flash
flash[:notice] = "You can stop rolling your own now."
Simple flash hash implementation for Rack apps.
Usage
Here's how to use it.
Install / add to Gemfile
gem 'rack-flash3'
Vanilla Rack apps
You can access flash entries via env['x-rack.flash']
. You can treat it either
like a regular flash hash:
env['x-rack.flash'][:notice] = 'You have logged out.'
Or you can pass the :accessorize
option to declare your flash types. Each of
these will have accessors defined on the flash object:
use Rack::Flash, :accessorize => [:notice, :error]
# Set a flash entry
env['x-rack.flash'].notice = 'You have logged out.'
# Get a flash entry
env['x-rack.flash'].notice # => 'You have logged out.'
# Set a a flash entry for only the current request
env['x-rack.flash'].notice! 'You have logged out.'
Sample rack app:
get = proc { |env|
[200, {},
env['x-rack.flash'].notice || 'No flash set. Try going to /set'
]
}
set = proc { |env|
env['x-rack.flash'].notice = 'Hey, the flash was set!'
[302, {'Location' => '/'},
'You are being redirected.'
]
}
builder = Rack::Builder.new do
use Rack::Session::Cookie
use Rack::Flash, :accessorize => true
map('/set') { run set }
map('/') { run get }
end
Rack::Handler::Mongrel.run builder, :Port => 9292
Sinatra
If you're using Sinatra, you can use the flash hash just like in Rails:
require 'sinatra/base'
require 'rack-flash'
class MyApp < Sinatra::Base
enable :sessions
use Rack::Flash
post '/set-flash' do
# Set a flash entry
flash[:notice] = "Thanks for signing up!"
# Get a flash entry
flash[:notice] # => "Thanks for signing up!"
# Set a flash entry for only the current request
flash.now[:notice] = "Thanks for signing up!"
end
end
If you've got any ideas on how to simplify access to the flash hash for vanilla Rack apps, let me know. It still feels a bit off to me.
Sweeping stale entries
By default Rack::Flash has slightly different behavior than Rails in that it
doesn't delete entries until they are used. If you want entries to be cleared
even if they are not ever accessed, you can use the :sweep
option:
use Rack::Flash, :sweep => true
This will sweep stale flash entries, whether or not you actually use them.