Arrays 每个ID的MongoDB运行日期范围总和

我有以下json文件（小样本），其中包含4个不同客户在不同日期的购买记录。我需要使用MongoDB/nosql来确定哪些客户在连续3天内至少总共购买了8次新产品

在这种情况下，客户ABC在2020-05-01至2020-05-03（连续3天）期间总共购买了32件商品。客户GHI在2020-07-28至2020-07-30（连续3天）期间也有20次购买。因此，我的输出应该只包含客户ABC和GHI。获取输出的代码是什么？非常感谢

{"cust_id":"ABC", "date":"2020-05-01", "new_purchase":2},
 {"cust_id":"ABC", "date":"2020-05-02", "new_purchase":16},
 {"cust_id":"ABC", "date":"2020-05-03", "new_purchase":14},
 {"cust_id":"ABC", "date":"2020-05-04", "new_purchase":0},
 {"cust_id":"ABC", "date":"2020-05-05", "new_purchase":5},
 {"cust_id":"DEF", "date":"2020-05-11", "new_purchase":3},
 {"cust_id":"DEF", "date":"2020-05-12", "new_purchase":0},
 {"cust_id":"DEF", "date":"2020-05-13", "new_purchase":0},
 {"cust_id":"DEF", "date":"2020-05-14", "new_purchase":0},
 {"cust_id":"DEF", "date":"2020-05-15", "new_purchase":1},
 {"cust_id":"GHI", "date":"2020-07-28", "new_purchase":0},
 {"cust_id":"GHI", "date":"2020-07-29", "new_purchase":3},
 {"cust_id":"GHI", "date":"2020-07-30", "new_purchase":17},
 {"cust_id":"GHI", "date":"2020-07-31", "new_purchase":0},
 {"cust_id":"GHI", "date":"2020-08-01", "new_purchase":1},
 {"cust_id":"JKL", "date":"2020-06-04", "new_purchase":7},
 {"cust_id":"JKL", "date":"2020-06-05", "new_purchase":0},
 {"cust_id":"JKL", "date":"2020-06-06", "new_purchase":0},
 {"cust_id":"JKL", "date":"2020-06-07", "new_purchase":0},
 {"cust_id":"JKL", "date":"2020-06-08", "new_purchase":0},
 {"cust_id":"JKL", "date":"2020-06-08", "new_purchase":2}

---

我假设这几天不会重复，这似乎是事实，只要你在最后的日期有一个打字错误

---

这个想法是：

将日期拆分，并按年份和月份分组

检查天数，我们每天测试

day-1

和

day+1

是否存在。如果它们存在，我们将其作为数组添加到集合中，如下所示：集合：

[[1,2,3]，[2,3,4]，[3,4,5]

这个数组是

$unwind

ed，我们可以找到这些天的产品总数

只有

total>8

匹配

如果您希望每人只获得一个结果，请添加

{$group:{{u id:“$id”}

---

日期真的是一个字符串还是一个ISO日期？为什么你要问同样的问题四次？

    [
        {
            "$group" : {
                "_id" : {
                    "cust_id" : "$cust_id",
                    "year" : {
                        "$arrayElemAt" : [
                            {
                                "$split" : [
                                    "$date",
                                    "-"
                                ]
                            },
                            0
                        ]
                    },
                    "month" : {
                        "$arrayElemAt" : [
                            {
                                "$split" : [
                                    "$date",
                                    "-"
                                ]
                            },
                            1
                        ]
                    }
                },
                "daysAndBuys" : {
                    "$push" : {
                        "day" : {
                            "$convert" : {
                                "input" : {
                                    "$arrayElemAt" : [
                                        {
                                            "$split" : [
                                                "$date",
                                                "-"
                                            ]
                                        },
                                        2
                                    ]
                                },
                                "to" : "int"
                            }
                        },
                        "buys" : "$new_purchase"
                    }
                }
            }
        },
        {
            "$addFields" : {
                "sets" : {
                    "$map" : {
                        "input" : "$daysAndBuys",
                        "as" : "d",
                        "in" : {
                            "$cond" : [
                                {
                                    "$and" : [
                                        {
                                            "$in" : [
                                                {
                                                    "$add" : [
                                                        "$$d.day",
                                                        1
                                                    ]
                                                },
                                                "$daysAndBuys.day"
                                            ]
                                        },
                                        {
                                            "$in" : [
                                                {
                                                    "$subtract" : [
                                                        "$$d.day",
                                                        1
                                                    ]
                                                },
                                                "$daysAndBuys.day"
                                            ]
                                        }
                                    ]
                                },
                                [
                                    "$$d.day",
                                    {
                                        "$add" : [
                                            "$$d.day",
                                            1
                                        ]
                                    },
                                    {
                                        "$subtract" : [
                                            "$$d.day",
                                            1
                                        ]
                                    }
                                ],
                                ""
                            ]
                        }
                    }
                }
            }
        },
        {
            "$addFields" : {
                "sets" : {
                    "$filter" : {
                        "input" : "$sets",
                        "as" : "s",
                        "cond" : {
                            "$ne" : [
                                "$$s",
                                ""
                            ]
                        }
                    }
                }
            }
        },
        {
            "$unwind" : "$sets"
        },
        {
            "$addFields" : {
                "daysAndBuys" : {
                    "$filter" : {
                        "input" : "$daysAndBuys",
                        "as" : "data",
                        "cond" : {
                            "$in" : [
                                "$$data.day",
                                "$sets"
                            ]
                        }
                    }
                }
            }
        },
        {
            "$project" : {
                "daysAndBuys" : 1,
                "total" : {
                    "$sum" : "$daysAndBuys.buys"
                }
            }
        },
        {
            "$match" : {
                "total" : {
                    "$gte" : 8
                }
            }
        }
    ]