OAuth Provider User Cache Key

application_controller.rb

class ApplicationController < ActionController::Base
  before_action :set_radius_user_cache_key

  # bunch-o-auth stuff goes here

  private

  def set_radius_user_cache_key
    if current_user
      cookies[:_radius_user_cache_key] = { value: current_user.cache_key, domain: :all, tld_length: 2 }
    else
      cookies[:_radius_user_cache_key] = { value: "none", domain: :all, tld_length: 2 }
    end
  end
end

application_controller_spec.rb

require 'rails_helper'

describe ApplicationController, :type => :controller do

  let(:centurion) { create(User) }

  def stub_sign_in(user)
    allow(controller).to receive(:current_user).and_return(user)
    sign_in user
  end

  controller do
    public :cookies
    def index
      render nothing: true
    end
  end

  describe "GET 'index'" do
    it "sets the user cache key cookie" do
      sign_in centurion
      allow(controller).to receive(:current_user).and_return(centurion)

      get 'index'

      key = controller.cookies[:_radius_user_cache_key]
      expect(key).to eq centurion.cache_key
    end
  end

end