add sessions for admin access

app/controllers/application_controller.rb

@@ -34,7 +34,12 @@ class ApplicationController < ActionController::Base
   end
 
   def require_admin
-    unless admin?
+    unless logged_in?
+      redirect_to login_path, alert: "You must be logged in to access this page."
+      return
+    end
+
+    unless current_user.admin?
       redirect_to root_path, alert: "You must be an administrator to access this page."
     end
   end