Use sessions in Lotus::Action. In response of https://gist.github.com/sidonath/10450111

application.rb

require 'lotus/controller'

module Blog
  module Action
    def self.included(base)
      base.class_eval do
        include Lotus::Action
        include Lotus::Action::Session
      end
    end
  end
end

class Show
  include Blog::Action
  
  def call(params)
    # ...
  end
end

config.ru

use Rack::Session::Cookie, secret: SecureRandom.hex(64)
run Show.new