book.rb

class Book < ActiveRecord::Base
  belongs_to :auther
  searchable do
    text :title, :default_boost => 2
    text :description 
    time :updated_at       # for sorting by recent
    integer :auther_id, :multi => true do
      authers.map {|auther| auther.auther_id}
    end
    boolean :published, :using => :published?
  end

  def published?
    state == :published
  end

end