Acts_as_ferret search associated tables?

Rails
1

I am currently using acts_as_ferret to search on a Posts table (title
and content fields). These posts also have tags (with has_many :tags,
:through => :questions_tags). I can’t figure out how to get
acts_as_ferret to work with that relationship and allow searching of
title, content, And tags at the same time (with the ability to set
boost as well). Can this be done?

2

class Post < ActiveRecord::Base
acts_as_ferret(
:fields => {
:ferret_tags => {boost, whatever},
other fields
}
)

def ferret_tags
tags.join " "
end

end