if !params[:q].blank?
        n = params[:q].split(" ")[0]
        a = params[:q].split(" ")[1] || params[:q].split(" ")[0]
        personas = Persona.where("lower(personas.nombre) like ? OR lower(personas.apellidos) like ?", n.downcase, a.downcase)
        filter_by = filter_by.where(:persona_id => personas)