From c555e28a4cf3690a95b5ed108d174f39cedd19b1 Mon Sep 17 00:00:00 2001
From: John Hawthorn <john@hawthorn.email>
Date: Mon, 18 Mar 2019 10:12:41 -0700
Subject: Ignore nil in LookupContext#formats=

This also removes the mutation we were performing on the values being
passed in.
---
 actionview/lib/action_view/lookup_context.rb | 1 +
 1 file changed, 1 insertion(+)

(limited to 'actionview/lib/action_view')

diff --git a/actionview/lib/action_view/lookup_context.rb b/actionview/lib/action_view/lookup_context.rb
index 2eaf188ecf..a0a2d41948 100644
--- a/actionview/lib/action_view/lookup_context.rb
+++ b/actionview/lib/action_view/lookup_context.rb
@@ -280,6 +280,7 @@ module ActionView
     # add :html as fallback to :js.
     def formats=(values)
       if values
+        values = values.compact
         values.concat(default_formats) if values.delete "*/*"
         if values == [:js]
           values << :html
-- 
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