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-rw-r--r--actionview/lib/action_view/lookup_context.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actionview/lib/action_view/lookup_context.rb b/actionview/lib/action_view/lookup_context.rb
index a0a2d41948..41751c2963 100644
--- a/actionview/lib/action_view/lookup_context.rb
+++ b/actionview/lib/action_view/lookup_context.rb
@@ -282,6 +282,8 @@ module ActionView
if values
values = values.compact
values.concat(default_formats) if values.delete "*/*"
+ values.uniq!
+
if values == [:js]
values << :html
@html_fallback_for_js = true