csexton · July 28, 2016 14:48 · Jul 28, 2016
diff --git a/application_controller.rb b/application_controller.rb
@@ -0,0 +1,16 @@
+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
+
diff --git a/application_controller_spec.rb b/application_controller_spec.rb
@@ -0,0 +1,31 @@
+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