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$sort（数组更新）

  • 2024/11/25

适用对象： MongoDB vCore

$sort 运算符用于在更新操作期间按升序或降序对文档中的数组进行排序。 此运算符有助于维护基于特定字段的有序数组。

语法

{
  "$sort": {
    "<field1>": <sortOrder>,
    "<field2>": <sortOrder>
  }
}

parameters

说明
field 要排序的数组中的字段。
sortOrder 排序顺序（1 表示升序，-1 表示降序）。

示例

让我们通过 stores 集合中的示例 json 文档来查看用法。

{
  "_id": "7954bd5c-9ac2-4c10-bb7a-2b79bd0963c5",
  "name": "Lakeshore Retail | DJ Equipment Stop - Port Cecile",
  "location": { "lat": 60.1441, "lon": -141.5012 },
  "staff": { "totalStaff": { "fullTime": 2, "partTime": 0 } },
  "sales": {
    "salesByCategory": [
      { "categoryName": "DJ Headphones", "totalSales": 35921 },
      { "categoryName": "DJ Cables", "totalSales": 1000 }
    ],
    "fullSales": 3700
  },
  "promotionEvents": [
    {
      "eventName": "Cyber Monday Event",
      "promotionalDates": {
        "startDate": { "Year": 2024, "Month": 8, "Day": 1 },
        "endDate": { "Year": 2024, "Month": 8, "Day": 7 }
      },
      "discounts": [ { "categoryName": "DJ Speakers", "discountPercentage": 25 } ]
    },
    {
      "eventName": "Black friday Event",
      "promotionalDates": {
        "startDate": { "Year": 2024, "Month": 8, "Day": 1 },
        "endDate": { "Year": 2024, "Month": 8, "Day": 7 }
      },
      "discounts": [ { "categoryName": "DJ Speakers", "discountPercentage": 25 } ]
    },
    {
      "eventName": "Mega Discount Days",
      "promotionalDates": {
        "startDate": { "Year": 2024, "Month": 5, "Day": 11 },
        "endDate": { "Year": 2024, "Month": 5, "Day": 18 }
      },
      "discounts": [ { "categoryName": "DJ Lights", "discountPercentage": 20 } ]
    }
  ],
  "tag": [
    "#ShopLocal",
    "#NewArrival",
    "#FashionStore",
    "#SeasonalSale",
    "#FreeShipping",
    "#MembershipDeals"
  ]
}

示例 1：对对象数组进行排序

该示例根据 totalSales 字段按升序对 salesByCategory 数组进行排序。

db.stores.update( { "_id": "7954bd5c-9ac2-4c10-bb7a-2b79bd0963c5" }
                , { $push: { "sales.salesByCategory": { $each: [], $sort: { "totalSales": 1 } } } }
)

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