Mongo按月份使用UNIX毫秒分组 [英] Mongo groupby month using UNIX millisecond time

问题描述

我有一个Mongo集合，看起来如下:

I have a Mongo collection that looks as follows:

[{
    id: 1,
    timestamp: 1534488870841,
    type: 'deposit'
}, {
    id: 1,
    timestamp: 1534488915119,
    type: 'deposit'
}]

如何进行查询以列出按月分组的所有deposit交易.

How can I make a query to list all deposit transactions, grouped by the month.

必须使用timestamp属性(UNIX毫秒)来计算月份.

The month must be calculated using the timestamp attribute (UNIX millisecond).

我可以按如下方式获得押金，但是我不确定如何分组:

I can get the deposit's as follows but I am unsure on how to group:

db.getCollection('transactions').find(
{"type":"deposit"});

修改:Mongo 3.4版

Edit: Mongo version 3.4

推荐答案

您可以在mongodb 4.0

You can try below aggregation in mongodb 4.0

您可以使用 聚合，然后 和> $month 聚合

db.collection.aggregate([
  { "$match": { "type": "deposits" }},
  { "$addFields": {
    "date": {
      "$toDate": "$timestamp"
    }
  }},
  { "$group": {
    "_id": { "$month": "$date" },
    "deposits": {
      "$push": "$$ROOT"
    }
  }}
])

您可以在mongodb 3.4

You can try below aggregation in mongodb 3.4

在 3.4 中，您可以在其中添加new Date()并 $dateToString 聚合

In 3.4 you can convert timestamp to date by adding new Date() in it and $group it by using $dateToString aggregation

db.collection.aggregate([
  { "$match": { "type": "deposits" }},
  { "$addFields": {
    "date": {
      "$add": [ new Date(0), "$timestamp" ]
    }
  }},
  { "$group": {
    "_id": {
      "$dateToString": {
        "format": "%m",
        "date": "$date"
      }
    },
    "deposits": {
      "$push": "$$ROOT"
    }
  }}
])

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