小编Ala*_*eng的帖子

我有类似于存储在mongodb中的文档

{
 "_id":"transaction_id"
 "customer":"some customer",
 "order_date":Date('2011-01-01'),
 "delivery_date":Date('2011-01-15'),
 "amt":500.0,
 "qty":50
},
{
 "_id":"transaction_id"
 "customer":"some customer",
 "order_date":Date('2011-01-01'),
 "delivery_date":Date('2011-02-04'),
 "amt":500.0,
 "qty":50
}

我希望对订单日期和交货日期进行一些汇总,以绘制每月订购和交付给每个客户的库存总量.

当然,我可以运行2个聚合查询来获得我想要的东西,但我只是想知道是否有可能获得具有2组具有1个命令的结果？

预期结果如下:

results:[{
 _id:{
   customer:"some customer"
 },
 orders:[
  {
   year:2011,
   month:1,
   qty:100
  },
   ...
 ]
 deliveries:[
  {
   year:2011,
   month:1,
   qty:50
  },
  {
   year:2011,
   month:2,
   qty:50
  },
  ...
 ]
},...]