Add data in between Simple Form association members

Hey there,

I am trying to use Simple Form’s association to list a bunch of radio buttons like so:

<%= simple_form_for(@applicant) do |f| %>

<%= f.association :track, :as => :radio_buttons %>

<% end %>

Assuming each track has many courses, how can I take every track from that association and loop over its courses to display them below the radio button? After all applicants need to know what each track has.