小编sco*_*txu的帖子

我想做一个查询,但查询速度很慢,我有五个这样的模型:

class Mya < ActiveRecord::Base
    has_many :mybs
end

class Myd < ActiveRecord::Base
    belongs_to :myc
end

class Myc < ActiveRecord::Base
    belongs_to :myb
    has_many :myds
    has_many :myes
end

class Myd < ActiveRecord::Base
    belongs_to :myc
end

class Mye < ActiveRecord::Base
    belongs_to :myc
end

比,我把一些测试数据插入mysql :(种子)

mya=Mya.create!(title: 'first test')
i=0
10.times{
    i=i+1
    myb=Myb.create!(title: "my_#{i}")
    5000.times{
        myc=Myc.create!(mya_id: mya.id, myb_id: myb.id)
        4.times {
            myd=Myd.create!(mya_id: mya.id, myb_id: myb.id, myc_id: myc.id)
            mye=Mye.create!(mya_id: mya.id, myb_id: myb.id, myc_id: myc.id)
        }
    }
}

在我的控制器中,我喜欢这样:

 def index
    @ms = Mya.first.to_json(:include => [{ …