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请任何人都帮我：Rails包含多个表
使用Rails我开发了一个应用程序。
我模式这个样子的：
class Score < ActiveRecord::Base
belongs_to :song
belongs_to :user
end
class Song < ActiveRecord::Base
has_one :gsong
has_many :scores
end
class Gsong < ActiveRecord::Base
belongs_to :song
end
class user < ActiveRecord::Base
has_many :scores
end
而且我ScoresController：
class scoresController < ApplicationController
def index
id = current_user.id
@scores = score.where(:user_id => id)
render :json => {
:scores => @scores.as_json(:include => {:gsong => { :include => { :song => { :only => [:title, :album]}}, :only => [:artwork]}}, :only => [:song_id, :score]),
}
end
它工作正常功能，但它使太多的查询数据库中的象下面这样：
score Load (0.1ms) SELECT `scores`.* FROM `scores` WHERE `scores`.`user_id` = 3
Gsong Load (0.1ms) SELECT `gsongs`.* FROM `gsongs` WHERE `gsongs`.`id` = 8 LIMIT 1
Song Load (0.1ms) SELECT `songs`.* FROM `songs` WHERE `songs`.`id` = 8 LIMIT 1
Gsong Load (0.1ms) SELECT `gsongs`.* FROM `gsongs` WHERE `gsongs`.`id` = 2 LIMIT 1
Song Load (0.1ms) SELECT `songs`.* FROM `songs` WHERE `songs`.`id` = 2 LIMIT 1
Gsong Load (0.1ms) SELECT `gsongs`.* FROM `gsongs` WHERE `gsongs`.`id` = 1 LIMIT 1
Song Load (0.1ms) SELECT `songs`.* FROM `songs` WHERE `songs`.`id` = 1 LIMIT 1
Gsong Load (0.1ms) SELECT `gsongs`.* FROM `gsongs` WHERE `gsongs`.`id` = 11 LIMIT 1
Song Load (0.1ms) SELECT `songs`.* FROM `songs` WHERE `songs`.`id` = 11 LIMIT 1
Gsong Load (0.1ms) SELECT `gsongs`.* FROM `gsongs` WHERE `gsongs`.`id` = 12 LIMIT 1
Song Load (0.1ms) SELECT `songs`.* FROM `songs` WHERE `songs`.`id` = 12 LIMIT 1
Gsong Load (0.1ms) SELECT `gsongs`.* FROM `gsongs` WHERE `gsongs`.`id` = 23 LIMIT 1
Song Load (0.1ms) SELECT `songs`.* FROM `songs` WHERE `songs`.`id` = 23 LIMIT 1
如何获取将这个数据与单个或两个查询，如：
Gsong Load (0.1ms) SELECT `gsongs`.* FROM `gsongs`
Song Load (0.3ms) SELECT `songs`.* FROM `songs` WHERE `songs`.`id` IN (8,2,1,11,12,23)