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in Technique[技术] by (71.8m points)

mongo array字段维护有限多少个

文档模型为

{
    "_id" : ObjectId("5fda6ae8bf760f494532a9fa"),
    "pairs": [
        {
            "value": "ip",
            "time":  ISODate("2020-12-17T04:15:33.000+08:00")
        },
        ...
    ]
}

每次更新会新增若干个pair, pair中value需要唯一,怎么从数据库角度比较优雅的维护长度限定为最多100个pair


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1 Answer

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by (71.8m points)

查询再判断处理


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