Rails - Jul 2011 - CanCan filtering meta_search results?

At the moment, I am running meta_search, and then filtering through  
CanCan after I have a set of results. Is there any other way to  
restrict the returned objects within the initial search query?

   def index
     @search =  
User 
.search :first_name_or_last_name_or_practice_name_or_role_contains_any  
=> params[:search].to_s.split('' '')
     @users = @search.order(''last_name ASC, first_name  
ASC'').accessible_by(current_ability).page(params[:page])
   end

Thanks in advance,

Walter

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