audit tweaks

app/controllers/application_controller.rb

@@ -65,7 +65,11 @@ class ApplicationController < ActionController::Base
   end
   
   def user_for_paper_trail
-    current_user.to_paper_trail rescue 'Public'
+    if user_signed_in?
+      current_user.to_paper_trail
+    else
+      "Public ip:#{client_remote_ip}"
+    end
   end
   
 end

app/models/user.rb

@@ -2,9 +2,11 @@ class User < ActiveRecord::Base
   include SentientModel
   model_stamper
   stampable
-  has_paper_trail ignore: [ :sign_in_count,
+  has_paper_trail ignore: [
+    :updated_at, :sign_in_count,
     :last_sign_in_at, :current_sign_in_at,
-    :last_sign_in_ip, :current_sign_in_ip ]
+    :last_sign_in_ip, :current_sign_in_ip
+  ]
   
   # Include default devise modules. Others available are:
   # :token_authenticatable, :encryptable, :timeoutable and :omniauthable