1 files changed, 1 insertions, 5 deletions
diff --git a/activerecord/lib/active_record/attribute_methods.rb b/activerecord/lib/active_record/attribute_methods.rb
index 220043c061..6e4f76aa73 100644
--- a/activerecord/lib/active_record/attribute_methods.rb
+++ b/activerecord/lib/active_record/attribute_methods.rb
@@ -437,7 +437,7 @@ module ActiveRecord
       def attributes_for_update(attribute_names)
         attribute_names &= self.class.column_names
         attribute_names.delete_if do |name|
-          readonly_attribute?(name)
+          self.class.readonly_attribute?(name)
         end
       end
 
@@ -460,10 +460,6 @@ module ActiveRecord
         end
       end
 
-      def readonly_attribute?(name)
-        self.class.readonly_attributes.include?(name)
-      end
-
       def pk_attribute?(name)
         name == @primary_key
       end