相关疑难解决方法(0)

在一个ObjectIds数组而不仅仅是一个ObjectId的字段上执行$ lookup的语法是什么？

示例订单文档:

{
  _id: ObjectId("..."),
  products: [
    ObjectId("..<Car ObjectId>.."),
    ObjectId("..<Bike ObjectId>..")
  ]
}

不工作查询:

db.orders.aggregate([
    {
       $lookup:
         {
           from: "products",
           localField: "products",
           foreignField: "_id",
           as: "productObjects"
         }
    }
])

期望的结果

{
  _id: ObjectId("..."),
  products: [
    ObjectId("..<Car ObjectId>.."),
    ObjectId("..<Bike ObjectId>..")
  ],
  productObjects: [
    {<Car Object>},
    {<Bike Object>}
  ],
}