Acts_as_ferret find_by_contents and :select

Is there a way to pass a :select option to find_by_contents using the
acts_as_ferret plugin? I’ve been trying something like this:

:select => “foo.id AS fooid”

and then accessing fooid on my model instance and I get no value back.
If this is possible, could someone get me an example that I could try
out? Thanks!

Regards,
Bill Rowel
http://billrowell.com/