Display tag "new" on actions

An author will see a "new" tag on each action or resource that has appeared on his dashboard since his last login.
Too add "new" tag on dashbord menu when there are new resources.

app/controllers/dashboard/base_controller.rb

@@ -1,5 +1,5 @@
 class Dashboard::BaseController < ApplicationController
-  before_action :authenticate_user!
+  before_action :authenticate_user!, :detect_new_actions_after_last_login
 
   include Dashboard::HasProposal
 
@@ -35,4 +35,9 @@ class Dashboard::BaseController < ApplicationController
   def next_goal
     @next_goal ||= Dashboard::Action.next_goal_for(proposal)
   end
+
+  def detect_new_actions_after_last_login
+    author_last_login = proposal.author.last_sign_in_at.to_date
+    @new_actions_since_last_login = Dashboard::Action.detect_new_actions_since(author_last_login, proposal)
+  end
 end