Ruby Forum Ferret > find_with_ferret :multi not working for me (latest version)

Previously, for all my ferret searches, i was using find_by_contents,
like this:

@stuff = LearningObject.find_by_contents("trumpet",
         #ferret options
         {:multi => [TeachingObject, LearningObject, Lesson, Course],
          :page => 1,
          :per_page => 15 },
         #find options
         {} )

That all worked fine.  We've upgraded to the latest ferret/a_a_f,
though, which no longer uses find_by_contents: i believe we're supposed
to use find_with_ferret instead.  However, if i do the equivalent, with
find_by_contents replaced with find_with_ferret, then the 'multi' part
doesn't work:  i get the same results as if i didn't pass multi at all.

My ferret-indexed classes all have ":store_class_name => true", which i
read was necessary for multi searches.  Can anyone help please?

thanks
max