Required fields on trackable

lib/devise/models/trackable.rb

@@ -11,6 +11,14 @@ module Devise
     # * last_sign_in_ip    - Holds the remote ip of the previous sign in
     #
     module Trackable
+      module ModuleMethods
+        extend self
+
+        def required_fields
+          [:current_sign_in_at, :current_sign_in_ip, :last_sign_in_at, :last_sign_in_ip, :sign_in_count]
+        end
+      end
+
       def update_tracked_fields!(request)
         old_current, new_current = self.current_sign_in_at, Time.now.utc
         self.last_sign_in_at     = old_current || new_current

test/models/trackable_test.rb

@@ -1,5 +1,13 @@
 require 'test_helper'
 
 class TrackableTest < ActiveSupport::TestCase
-
+  test 'required_fields should contain the fields that Devise uses' do
+    assert_equal Devise::Models::Trackable::ModuleMethods.required_fields.sort, [
+      :current_sign_in_at,
+      :current_sign_in_ip,
+      :last_sign_in_at,
+      :last_sign_in_ip,
+      :sign_in_count
+    ]
+  end
 end