Merge pull request rails#14469 from tiegz/timestamp_inheritance_fix

Swap Timestamp/Callbacks order in ActiveRecord::Base

Author: rafaelfranca

activerecord/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   Make possible to change `record_timestamps` inside Callbacks.
+
+    *Tieg Zaharia*
+
 *   Fixed error where .persisted? throws SystemStackError for an unsaved model with a
     custom primary key that didn't save due to validation error.
 

activerecord/lib/active_record/base.rb

@@ -310,8 +310,8 @@ class Base
     include Locking::Optimistic
     include Locking::Pessimistic
     include AttributeMethods
-    include Callbacks
     include Timestamp
+    include Callbacks
     include Associations
     include ActiveModel::SecurePassword
     include AutosaveAssociation

activerecord/test/cases/timestamp_test.rb

@@ -71,6 +71,24 @@ def test_saving_when_instance_record_timestamps_is_false_doesnt_update_its_times
     assert_equal @previously_updated_at, @developer.updated_at
   end
 
+  def test_saving_when_callback_sets_record_timestamps_to_false_doesnt_update_its_timestamp
+    klass = Class.new(Developer) do
+      before_update :cancel_record_timestamps
+      def cancel_record_timestamps
+        self.record_timestamps = false
+        return true
+      end
+    end
+
+    developer = klass.first
+    previously_updated_at = developer.updated_at
+
+    developer.name = "New Name"
+    developer.save!
+
+    assert_equal previously_updated_at, developer.updated_at
+  end
+
   def test_touching_an_attribute_updates_timestamp
     previously_created_at = @developer.created_at
     @developer.touch(:created_at)