Ruby / Roda - Web Framework / Plugins / :flash

Introduction

The :flash plugin adds a +flash+ instance method to Roda, for typical web application flash handling, where values set in the current flash hash are available in the next request.

With the example below, if a POST request is submitted, it will redirect and the resulting GET request will return 'b'.

plugin :flash

route do |r|

  r.is '' do
    
    r.get do
      flash['a']
    end

    r.post do
      flash['a'] = 'b'
      r.redirect('')
    end
    
  end
  
end

InstanceMethods

#.flash

Access the flash hash for the current request, loading it from the session if it is not already loaded.

#.call

If the routing doesn't raise an error, rotate the flash hash in the session so the next request has access to it.