From 1edf103b528e91dbed987937936d73dab5452d81 Mon Sep 17 00:00:00 2001
From: Akira Matsuda <ronnie@dio.jp>
Date: Fri, 8 May 2020 23:55:53 +0900
Subject: [PATCH] undef_method can take varargs

---
 activemodel/lib/active_model/attribute_methods.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/activemodel/lib/active_model/attribute_methods.rb b/activemodel/lib/active_model/attribute_methods.rb
index 0c3d5ea701..f584ed99a4 100644
--- a/activemodel/lib/active_model/attribute_methods.rb
+++ b/activemodel/lib/active_model/attribute_methods.rb
@@ -329,7 +329,7 @@ module ActiveModel
       #   person.name_short? # => NoMethodError
       def undefine_attribute_methods
         generated_attribute_methods.module_eval do
-          instance_methods.each { |m| undef_method(m) }
+          undef_method(*instance_methods)
         end
         attribute_method_matchers_cache.clear
       end