From 6129d1f937c64eadd6118a89fea556b201b6b4d4 Mon Sep 17 00:00:00 2001
From: George Claghorn <george@basecamp.com>
Date: Mon, 11 Dec 2017 18:32:05 -0500
Subject: Fix optimizing GIF variants using mogrify's -layers option

---
 activestorage/app/models/active_storage/variation.rb | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/activestorage/app/models/active_storage/variation.rb b/activestorage/app/models/active_storage/variation.rb
index 13bad87cac..fc4305dcc5 100644
--- a/activestorage/app/models/active_storage/variation.rb
+++ b/activestorage/app/models/active_storage/variation.rb
@@ -46,11 +46,13 @@ class ActiveStorage::Variation
   # Accepts an open MiniMagick image instance, like what's returned by <tt>MiniMagick::Image.read(io)</tt>,
   # and performs the +transformations+ against it. The transformed image instance is then returned.
   def transform(image)
-    transformations.each do |(method, argument)|
-      if eligible_argument?(argument)
-        image.public_send(method, argument)
-      else
-        image.public_send(method)
+    transformations.each do |method, argument|
+      image.mogrify do |command|
+        if eligible_argument?(argument)
+          command.public_send(method, argument)
+        else
+          command.public_send(method)
+        end
       end
     end
   end
-- 
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