Samantha John wrote in post #1032986:
I'd recommend creating an attr_accessor for :primary on your Title
model.
In your form you could do something like:
f.object.roles.each do |role|
f.radio_button :primary, :role.id
f.label :primary

which should have the desired behavior.
This solution does not work with newly added nested objects as they
don't have an ID yet (with cocoon/railscasts way nested forms handling).

I've asked a question about the same issue here :
http://stackoverflow.com/questions/14043884/radio-buttons-grouped-over-multiple-nested-form-entries

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postedNov 21, '11 at 10:23p
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