search for: normalized_ranking

Hi! I''m using acts_as_ferret in my rails project and i need to order the search results by a combination of the result given by ferret (score) and a ranking in the database (normalized also). this combination can be like that: 0.4*ferret_score+0.6*database_score this database_score is also indexed any idea? and someone know how to access the ferret data in the object returned by