Install ruby-rack-flash3 by entering the following commands in the terminal:
sudo apt update sudo apt install ruby-rack-flash3
Description:
Flash hash for Ruby Rack applications
Rack Flash is a simple flash hash implementation for Rack apps. This version is Travis Reeder's fork of Pat Nakajima's original implementation that works with Sinatra.
Homepage: https://github.com/treeder/rack-flash
Version: 1.0.5-2
Section: universe/ruby