1 files changed, 4 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/attribute.rb b/activerecord/lib/active_record/attribute.rb
index 38281158d8..5b4e967e94 100644
--- a/activerecord/lib/active_record/attribute.rb
+++ b/activerecord/lib/active_record/attribute.rb
@@ -231,6 +231,10 @@ module ActiveRecord
           false
         end
 
+        def forgetting_assignment
+          dup
+        end
+
         def with_type(type)
           self.class.new(name, type)
         end