From 46d207fde47f7db810e7b1fcc1ba20094ec28824 Mon Sep 17 00:00:00 2001
From: Akira Matsuda <ronnie@dio.jp>
Date: Wed, 31 Jul 2019 06:29:30 +0900
Subject: Avoid creating new Array when looking up already registered detail

---
 actionview/lib/action_view/lookup_context.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/actionview/lib/action_view/lookup_context.rb b/actionview/lib/action_view/lookup_context.rb
index 211fbc8e6c..f050d54e27 100644
--- a/actionview/lib/action_view/lookup_context.rb
+++ b/actionview/lib/action_view/lookup_context.rb
@@ -29,7 +29,7 @@ module ActionView
       Accessors.define_method(:"default_#{name}", &block)
       Accessors.module_eval <<-METHOD, __FILE__, __LINE__ + 1
         def #{name}
-          @details.fetch(:#{name}, [])
+          @details[:#{name}] || []
         end
 
         def #{name}=(value)
-- 
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