MongoDB累计追加

Question

MongoDB累计追加

我有：

[
    {"d" : 20050511, "u" : 1},
    {"d" : 20050511, "u" : 2},
    {"d" : 20050511, "u" : 3},
    {"d" : 20050511, "u" : 4},

    {"d" : 20050512, "u" : 1},
    {"d" : 20050512, "u" : 2},
    {"d" : 20050512, "u" : 3},
    {"d" : 20050512, "u" : 7},

    {"d" : 20050513, "u" : 18},
    {"d" : 20050513, "u" : 21},
    {"d" : 20050513, "u" : 23}
]

我想将其转换为：

[
    {"d" : 20050511, "u" : 1},
    {"d" : 20050511, "u" : 2},
    {"d" : 20050511, "u" : 3},
    {"d" : 20050511, "u" : 4},

    {"d" : 20050512, "u" : 1},
    {"d" : 20050512, "u" : 2},
    {"d" : 20050512, "u" : 3},
    {"d" : 20050512, "u" : 7}
    {"d" : 20050512, "u" : 4},

    {"d" : 20050513, "u" : 18},
    {"d" : 20050513, "u" : 21},
    {"d" : 20050513, "u" : 23},
    {"d" : 20050513, "u" : 1},
    {"d" : 20050513, "u" : 2},
    {"d" : 20050513, "u" : 3},
    {"d" : 20050513, "u" : 4},
    {"d" : 20050513, "u" : 7}
]

基本上，我希望每个日期累积前进（我将日期存储为整数）;意思是20050512它是20050511 + 20050512的独特联盟;对于20050513，它是20050512 + 20050513的独特联盟

我尝试了一些聚合管道衬里，但收效甚微。我可以在应用程序层中执行此操作，但这将导致巨大的i / o和长时间;由于数据超过15年，每个日期有超过50K的文档。