MongoDB-JSON- 如何在数组中进行查询？

Question

我有一个包含 20 个文档的集合，每个文档都有一个数组。我想知道如何搜索文档中的排列它看起来像：

"exist" : 66658,
"warehouse" : [ 
    {
        "stock_I" : "available",
        "prod_st" : "active",
        "last_sale" : "2022-11-23",
        "factura_uv" : 154368244,
        "price" : 8
    }, 
    {
        "stock_II" : "available",
        "prod_st" : "active",
        "last_sale" : "2022-04-18",
        "factura_uv" : 879624124,
        "price" : 8
    }, 
    {
        "stock_III" : "available",
        "prod_st" : "active",
        "last_sale" : "2021-07-05",
        "factura_uv" : 357846988,
        "price" : 8
    }
],

我想要做的是能够运行一个命令，它只显示 stock_II

中可用的产品

我的mongo版本是5.0.4

感谢您的帮助

Answer 1

db.collection.aggregate([
  {
    $match: {
      "warehouse.stock_II": "available"
    }
  },
  {
    $set: {
      warehouse: {
        $filter: {
          input: "$warehouse",
          as: "w",
          cond: { $eq: [ "$$w.stock_II", "available" ] }
        }
      }
    }
  }
])

mongoplayground

db.collection.find({
  "warehouse.stock_II": "available"
},
{
  "warehouse.$": 1
})

mongoplayground

MongoDB-JSON- 如何在数组中进行查询？

MongoDB-JSON- How to make a query inside an array?

arrays

json

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nosql

robo3t