Return a null object from `AttributeSet#[]`

1 files changed, 3 insertions, 3 deletions

diff --git a/activerecord/lib/active_record/attribute_methods/dirty.rb b/activerecord/lib/active_record/attribute_methods/dirty.rb
index ca71834641..e1a86fd3aa 100644
--- a/activerecord/lib/active_record/attribute_methods/dirty.rb
+++ b/activerecord/lib/active_record/attribute_methods/dirty.rb
@@ -129,7 +129,7 @@ module ActiveRecord
       end
 
       def _field_changed?(attr, old_value)
-        attribute_named(attr).changed_from?(old_value)
+        @attributes[attr].changed_from?(old_value)
       end
 
       def changed_in_place
@@ -140,7 +140,7 @@ module ActiveRecord
 
       def changed_in_place?(attr_name)
         old_value = original_raw_attribute(attr_name)
-        attribute_named(attr_name).changed_in_place_from?(old_value)
+        @attributes[attr_name].changed_in_place_from?(old_value)
       end
 
       def original_raw_attribute(attr_name)
@@ -154,7 +154,7 @@ module ActiveRecord
       end
 
       def store_original_raw_attribute(attr_name)
-        original_raw_attributes[attr_name] = attribute_named(attr_name).value_for_database
+        original_raw_attributes[attr_name] = @attributes[attr_name].value_for_database
       end
 
       def store_original_raw_attributes