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-rw-r--r--actionpack/lib/action_view/helpers/form_helper.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb
index 7df74d96fb..920dc3f794 100644
--- a/actionpack/lib/action_view/helpers/form_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_helper.rb
@@ -1207,7 +1207,7 @@ module ActionView
options["id"] = options.fetch("id"){ tag_id }
end
- options["name"] += "[]" if options["multiple"]
+ options["name"] += "[]" if options["multiple"] && !options["name"].ends_with?("[]")
options["id"] = [options.delete('namespace'), options["id"]].compact.join("_").presence
end