Start with a Rails app with authentication via Persona, Foundation CSS

app/controllers/application_controller.rb

@@ -0,0 +1,15 @@
+class ApplicationController < ActionController::Base
+  # Prevent CSRF attacks by raising an exception.
+  # For APIs, you may want to use :null_session instead.
+  protect_from_forgery with: :exception
+
+  def current_user
+    User.find(session[:user_id]) if session[:user_id].present?
+  end
+
+  def signed_in?
+    !!current_user
+  end
+
+  helper_method :current_user, :signed_in?
+end

app/controllers/search_controller.rb

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+class SearchController < ApplicationController
+  def index
+  end
+end

app/controllers/sessions_controller.rb

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+class SessionsController < ApplicationController
+  def create
+    if user = User.find_or_create_from_auth_hash(auth_hash)
+      session[:user_id] = user.id
+    end
+    redirect_to root_path
+  end
+
+  def destroy
+    reset_session
+    redirect_to root_path
+  end
+
+  protected
+
+  def auth_hash
+    request.env['omniauth.auth']
+  end
+end