将 Mongo Db 数组拆分为多个文档

Question

我的收藏中有以下文档

{
  "_id": "12345",
  "Products": [
    "Product1",
    "Product2"
  ],
  "State": "active",
}

如何根据数组投影到多个文档中？所需的输出应该是这样的

{
  "_id": "12345",
  "Product": "Product1",
  "State": "active",
}

{
  "_id": "12345",
  "Product": "Product2",
  "State": "active",
}

Answer 1

1. $unwind

   - 将

   Products

   数组解构为多个文档。

2. $set

   - 使用

   Product

   设置

   Products

   字段并删除

   Products

   字段。

db.collection.aggregate([
  {
    $unwind: "$Products"
  },
  {
    $set: {
      Product: "$Products",
      Products: "$$REMOVE"
    }
  }
])

演示@Mongo Playground