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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 516492ca30..7e4f5fa65c 100644
--- a/actionpack/lib/action_view/helpers/form_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_helper.rb
@@ -1802,7 +1802,7 @@ module ActionView
association = convert_to_model(association)
if association.respond_to?(:persisted?)
- association = [association] if @object.send(association_name).is_a?(Array)
+ association = [association] if @object.send(association_name).respond_to?(:to_ary)
elsif !association.respond_to?(:to_ary)
association = @object.send(association_name)
end