Another plugin. This one adds a few methods to/for associations. See
below for the README. The intention is that with these methods it
becomes very easy to build collection_selects
<%= collection_select 'person', 'continent_id',
@person.continent_candidates, 'id', 'name' %>
I'm looking forward to your comments. Please keep in mind that this code
needs some more serious testing as I'm sure the current tests don't
cover all relevant cases.