$sortArray

$sortArray 运算符用于对数组的元素进行排序。 当需要根据特定字段或条件对文档中的数组进行排序时，运算符非常有用。 它可以应用于嵌入式文档数组或简单的值数组。

语法

{
  $sortArray: {
    input: <arrayExpression>,
    sortBy: <sortSpecification>
  }
}

参数

例子

请考虑商店集合中的这个示例文档。

{
    "_id": "0fcc0bf0-ed18-4ab8-b558-9848e18058f4",
    "name": "First Up Consultants | Beverage Shop - Satterfieldmouth",
    "location": {
        "lat": -89.2384,
        "lon": -46.4012
    },
    "staff": {
        "totalStaff": {
            "fullTime": 8,
            "partTime": 20
        }
    },
    "sales": {
        "totalSales": 75670,
        "salesByCategory": [
            {
                "categoryName": "Wine Accessories",
                "totalSales": 34440
            },
            {
                "categoryName": "Bitters",
                "totalSales": 39496
            },
            {
                "categoryName": "Rum",
                "totalSales": 1734
            }
        ]
    },
    "promotionEvents": [
        {
            "eventName": "Unbeatable Bargain Bash",
            "promotionalDates": {
                "startDate": {
                    "Year": 2024,
                    "Month": 6,
                    "Day": 23
                },
                "endDate": {
                    "Year": 2024,
                    "Month": 7,
                    "Day": 2
                }
            },
            "discounts": [
                {
                    "categoryName": "Whiskey",
                    "discountPercentage": 7
                },
                {
                    "categoryName": "Bitters",
                    "discountPercentage": 15
                },
                {
                    "categoryName": "Brandy",
                    "discountPercentage": 8
                },
                {
                    "categoryName": "Sports Drinks",
                    "discountPercentage": 22
                },
                {
                    "categoryName": "Vodka",
                    "discountPercentage": 19
                }
            ]
        },
        {
            "eventName": "Steal of a Deal Days",
            "promotionalDates": {
                "startDate": {
                    "Year": 2024,
                    "Month": 9,
                    "Day": 21
                },
                "endDate": {
                    "Year": 2024,
                    "Month": 9,
                    "Day": 29
                }
            },
            "discounts": [
                {
                    "categoryName": "Organic Wine",
                    "discountPercentage": 19
                },
                {
                    "categoryName": "White Wine",
                    "discountPercentage": 20
                },
                {
                    "categoryName": "Sparkling Wine",
                    "discountPercentage": 19
                },
                {
                    "categoryName": "Whiskey",
                    "discountPercentage": 17
                },
                {
                    "categoryName": "Vodka",
                    "discountPercentage": 23
                }
            ]
        }
    ]
}

示例 1：对嵌入文档数组进行排序

此查询按sales.salesByCategory降序对每个文档中的totalSales数组进行排序。

db.stores.aggregate([{
    $match: {
        _id: "d3c9df51-41bd-4b4e-a26b-b038d9cf8b45"
    }
}, {
    $project: {
        sortedSalesByCategory: {
            $sortArray: {
                input: "$sales.salesByCategory",
                sortBy: {
                    totalSales: -1
                }
            }
        }
    }
}])

此查询返回以下结果。

[
    {
        "_id": "d3c9df51-41bd-4b4e-a26b-b038d9cf8b45",
        "sortedSalesByCategory": [
            {
                "categoryName": "DJ Accessories",
                "totalSales": 60000
            },
            {
                "categoryName": "Music Accessories",
                "totalSales": 40000
            },
            {
                "categoryName": "DJ Speakers",
                "totalSales": 36972
            },
            {
                "categoryName": "DJ Headphones",
                "totalSales": 12877
            }
        ]
    }
]

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