Question

例如，我有两个文件

class Task
  include Mongoid::Document

  field :name, type: String
  belongs_to :person
end

和

class Person
  include Mongoid::Document

  field :name, type: String
  has_one :stage
end

我的控制器中有一个方法

def index
  tasks = Task.all
  render :json => tasks.to_json(:include => :person)
end

查看生成的查询，我看到它查找每个任务的人（当前有3个任务）

MOPED: 127.0.0.1:27017 QUERY        database=pipeline_development collection=tasks selector={} flags=[:slave_ok] limit=0 skip=0 fields=nil (0.3619ms)
MOPED: 127.0.0.1:27017 QUERY        database=pipeline_development collection=people selector={"$query"=>{"_id"=>"50f12eb2cce8b43b05000001"}, "$orderby"=>{:_id=>1}} flags=[:slave_ok] limit=-1 skip=0 fields=nil (0.1998ms)
MOPED: 127.0.0.1:27017 QUERY        database=pipeline_development collection=people selector={"$query"=>{"_id"=>"50f12eb2cce8b43b05000001"}, "$orderby"=>{:_id=>1}} flags=[:slave_ok] limit=-1 skip=0 fields=nil (0.3881ms)
MOPED: 127.0.0.1:27017 QUERY        database=pipeline_development collection=people selector={"$query"=>{"_id"=>"50f12eb2cce8b43b05000001"}, "$orderby"=>{:_id=>1}} flags=[:slave_ok] limit=-1 skip=0 fields=nil (0.2272ms)

这实际上可以加起来（我的数据库中每次查找的时间实际上是25ms而不是0.3ms）并导致不合理的缓慢。

有关如何解决此问题的任何建议吗？

修改

我试着加载

def index
  tasks = Task.all.includes(:person)
  render :json => tasks.to_json(:include => :person)
end

但它似乎没有改变任何东西

使用mongoid的：include选项时to_json很慢

0 个答案: