From 732372c928744a4da441691f84bc137969ba4eff Mon Sep 17 00:00:00 2001
From: Vinicius Stock <vinicius.stock@shopify.com>
Date: Fri, 22 May 2020 14:31:57 -0400
Subject: [PATCH] Reduce allocations in action_view cache expiry

---
 actionview/lib/action_view/cache_expiry.rb | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/actionview/lib/action_view/cache_expiry.rb b/actionview/lib/action_view/cache_expiry.rb
index 27690561b7..086f2dcb3a 100644
--- a/actionview/lib/action_view/cache_expiry.rb
+++ b/actionview/lib/action_view/cache_expiry.rb
@@ -42,8 +42,7 @@ module ActionView
 
     private
       def dirs_to_watch
-        fs_paths = all_view_paths.grep(FileSystemResolver)
-        fs_paths.map(&:path).sort.uniq
+        all_view_paths.grep(FileSystemResolver).map!(&:path).tap(&:uniq!).sort!
       end
 
       def all_view_paths