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如何避免mongodb文檔中對象數組的重復

[英]How to avoid duplication in array of objects in a mongodb document

 原文  2021-11-05 03:21:34  8   1    node.js/ mongodb/ mongoose/ mongodb-query/ aggregation-framework

問題描述

這是文檔示例：

{
    "_id": "658016",
    "playerName": "Kuldeep Singh",
    "tournamentId": "197831",
    "score": [
        {
            "_id": "1611380",
            "runsScored": 21,
            "ballFaced": 10,
            "fours": 3,
            "sixes": 1,
            "strikeRate": 210,
            "oversBowled": 3,
            "runsConceded": 34,
            "economyRate": 11.33,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "c Mayank b Nitin Gudle -(reddy)",
            "catches": [],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1602721",
            "runsScored": 21,
            "ballFaced": 14,
            "fours": 1,
            "sixes": 1,
            "strikeRate": 150,
            "oversBowled": 3,
            "runsConceded": 28,
            "economyRate": 9.33,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "not out",
            "catches": [],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1536540",
            "runsScored": 1,
            "ballFaced": 3,
            "fours": 0,
            "sixes": 0,
            "strikeRate": 33.33,
            "oversBowled": 2,
            "runsConceded": 7,
            "economyRate": 3.5,
            "wickets": 3,
            "maiden": 0,
            "howToOut": "b Lalit",
            "catches": [],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1536483",
            "runsScored": 0,
            "ballFaced": 0,
            "fours": 0,
            "sixes": 0,
            "strikeRate": 0,
            "oversBowled": 0,
            "runsConceded": 0,
            "economyRate": 0,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "-",
            "catches": [],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1501201",
            "runsScored": 12,
            "ballFaced": 5,
            "fours": 1,
            "sixes": 1,
            "strikeRate": 240,
            "oversBowled": 2,
            "runsConceded": 28,
            "economyRate": 14,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "c Rahul Mogri b Harshal Tupe",
            "catches": [
                "Chetan Tupe",
                "Kaustubh Tupe"
            ],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1501195",
            "runsScored": 74,
            "ballFaced": 27,
            "fours": 5,
            "sixes": 7,
            "strikeRate": 274.07,
            "oversBowled": 3,
            "runsConceded": 44,
            "economyRate": 14.67,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "not out",
            "catches": [
                "Ashish Thantharatey"
            ],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1461428",
            "runsScored": 8,
            "ballFaced": 4,
            "fours": 0,
            "sixes": 1,
            "strikeRate": 200,
            "oversBowled": 3,
            "runsConceded": 29,
            "economyRate": 9.67,
            "wickets": 2,
            "maiden": 0,
            "howToOut": "run out Mayank / Sahil Raheja",
            "catches": [],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1461413",
            "runsScored": 23,
            "ballFaced": 12,
            "fours": 0,
            "sixes": 3,
            "strikeRate": 191.67,
            "oversBowled": 2,
            "runsConceded": 18,
            "economyRate": 9,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "c Sumit Gandhi b Arun Stambhampelli",
            "catches": [
                "Arun Stambhampelli (c)"
            ],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1451183",
            "runsScored": 16,
            "ballFaced": 6,
            "fours": 2,
            "sixes": 1,
            "strikeRate": 266.67,
            "oversBowled": 2,
            "runsConceded": 11,
            "economyRate": 5.5,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "c Syed Jamaal Nasir b Aman Deep",
            "catches": [
                "Mohan Slathia (c)"
            ],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1451132",
            "runsScored": 26,
            "ballFaced": 10,
            "fours": 1,
            "sixes": 3,
            "strikeRate": 260,
            "oversBowled": 3,
            "runsConceded": 18,
            "economyRate": 6,
            "wickets": 3,
            "maiden": 0,
            "howToOut": "c Javed b Ram Lomte",
            "catches": [
                "Saheb Desai"
            ],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1392788",
            "runsScored": 13,
            "ballFaced": 6,
            "fours": 2,
            "sixes": 0,
            "strikeRate": 216.67,
            "oversBowled": 3,
            "runsConceded": 30,
            "economyRate": 10,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "not out",
            "catches": [
                "Sachin Patil"
            ],
            "stumping": [],
            "runout": [],
            "participatedRunout": [
                "Pankaj Rastogi"
            ]
        },
        {
            "_id": "1611380",
            "runsScored": 0,
            "ballFaced": 0,
            "fours": 0,
            "sixes": 0,
            "strikeRate": 0,
            "oversBowled": 0,
            "runsConceded": 0,
            "economyRate": 0,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "-",
            "catches": [],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1602721",
            "runsScored": 0,
            "ballFaced": 0,
            "fours": 0,
            "sixes": 0,
            "strikeRate": 0,
            "oversBowled": 0,
            "runsConceded": 0,
            "economyRate": 0,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "-",
            "catches": [],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1536540",
            "runsScored": 0,
            "ballFaced": 0,
            "fours": 0,
            "sixes": 0,
            "strikeRate": 0,
            "oversBowled": 0,
            "runsConceded": 0,
            "economyRate": 0,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "-",
            "catches": [],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1501201",
            "runsScored": 0,
            "ballFaced": 0,
            "fours": 0,
            "sixes": 0,
            "strikeRate": 0,
            "oversBowled": 0,
            "runsConceded": 0,
            "economyRate": 0,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "-",
            "catches": [],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1501195",
            "runsScored": 0,
            "ballFaced": 0,
            "fours": 0,
            "sixes": 0,
            "strikeRate": 0,
            "oversBowled": 0,
            "runsConceded": 0,
            "economyRate": 0,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "-",
            "catches": [],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1461428",
            "runsScored": 0,
            "ballFaced": 0,
            "fours": 0,
            "sixes": 0,
            "strikeRate": 0,
            "oversBowled": 0,
            "runsConceded": 0,
            "economyRate": 0,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "-",
            "catches": [],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1461413",
            "runsScored": 0,
            "ballFaced": 0,
            "fours": 0,
            "sixes": 0,
            "strikeRate": 0,
            "oversBowled": 0,
            "runsConceded": 0,
            "economyRate": 0,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "-",
            "catches": [],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1451183",
            "runsScored": 0,
            "ballFaced": 0,
            "fours": 0,
            "sixes": 0,
            "strikeRate": 0,
            "oversBowled": 0,
            "runsConceded": 0,
            "economyRate": 0,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "-",
            "catches": [],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1451132",
            "runsScored": 0,
            "ballFaced": 0,
            "fours": 0,
            "sixes": 0,
            "strikeRate": 0,
            "oversBowled": 0,
            "runsConceded": 0,
            "economyRate": 0,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "-",
            "catches": [],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        },
        {
            "_id": "1392788",
            "runsScored": 0,
            "ballFaced": 0,
            "fours": 0,
            "sixes": 0,
            "strikeRate": 0,
            "oversBowled": 0,
            "runsConceded": 0,
            "economyRate": 0,
            "wickets": 0,
            "maiden": 0,
            "howToOut": "-",
            "catches": [],
            "stumping": [],
            "runout": [],
            "participatedRunout": []
        }
    ],
    "__v": 0
}

注意：在本文檔中的 score 數組中，索引 10 之后存在重復的對象。

文檔最初使用以下代碼更新（在此之前，分數數組為空）：

await Scorecard.findOneAndUpdate(
        { _id: fielder.player_id, },
        {
          $addToSet: {
            "score": {
              _id: matchID
            }
          }
        }
      );

稍后在代碼中，再次更新 score 數組中的對象以更改最初未更改字段的默認值（在 mongoose 模式中設置）。

但是，問題是當上面引用的代碼在一段時間后再次運行時，它會復制數組中的所有對象。 我知道，還有其他類似的問題，但我是 mongodb 的初學者，無法制作復雜的聚合管道。 任何幫助是極大的贊賞。

1 個解決方案

解決方案1
 0  2021-11-05 06:55:24

$addToSet運算符僅在數組不存在的情況下將元素添加到數組中。

該數組中的每個元素都是一個對象。 對象按照https://docs.mongodb.com/manual/reference/bson-type-comparison-order/#objects 上的 mongodb 文檔中所述進行比較 基本上，如果兩個對象具有完全相同的字段，則它們是相等的，在完全相同的順序，每個順序都具有完全相同的值。 換句話說，如果它們不相同，則它們不相等。

我在問題的數組中沒有看到任何重復項。 有一些_id字段具有相同的值，但那些包含其他幾個不同的字段，因此它們不是重復的。

如果您需要更新數組中對象的值，還有其他幾個關於修改嵌套文檔的問題。

我懷疑您要做的是檢測數組中是否已存在具有該 id 的對象，如果已預設則更新，如果沒有則插入。
在這種情況下，您可以嘗試使用更新的管道形式，以及filter和mergeObjects運算符。

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