Javascript 按日期分组Mongo聚合
我正在尝试使用Mongo聚合框架按日期对文档进行分组。我尝试了很多方法,但都无法确定问题所在。我的查询如下所示:Javascript 按日期分组Mongo聚合,javascript,mongodb,aggregation-framework,Javascript,Mongodb,Aggregation Framework,我正在尝试使用Mongo聚合框架按日期对文档进行分组。我尝试了很多方法,但都无法确定问题所在。我的查询如下所示: // get current date and then get the date 8 months ago var now = Date.now() var lastMonth = 60*60*24*30*1000*8 lastMonth = now - lastMonth var query = { type: 'something',
// get current date and then get the date 8 months ago
var now = Date.now()
var lastMonth = 60*60*24*30*1000*8
lastMonth = now - lastMonth
var query = {
type: 'something',
deleted: {$ne: true},
created: {$gte: lastMonth}
}
var stickerNames = [];
db.Message.aggregate([{$match: query},
{$group:
{_id: {data: '$data',
month: {$month: '$created'},
year: {$year: '$created'}
},
count:{$sum: 1}
}
},
{$sort:
{count: 1}}],
function(err, stuff){
if(err){
return res.json({error: err.message})
}
else{
return res.json({data: stuff})
}
})
我已经尝试了很多关于日期的不同方法,也检查了其他的帖子,但到目前为止都没有效果。如果我取出created:{$gte:lastmount}子句,那么它将返回每一个“something”类型的文档。如果我离开它,它不会返回任何文档
创建的字段在模型中由
created: {type: Date, default: Date.now}
据我所知,“按日期分组”是指按“日-月-年”分组。也许您缺少聚合功能
给定此示例数据集:
> db.w.find({})
{ "_id" : ObjectId("55503d31a3d32cf6295ad897"),
"created" : ISODate("2014-12-08T12:00:00Z"),
"data" : 1 }
{ "_id" : ObjectId("55503d43a3d32cf6295ad898"),
"created" : ISODate("2014-12-08T08:00:00Z"),
"data" : 2 }
{ "_id" : ObjectId("55503d4ba3d32cf6295ad899"),
"created" : ISODate("2014-12-08T20:00:00Z"),
"data" : 3 }
{ "_id" : ObjectId("55503d55a3d32cf6295ad89a"),
"created" : ISODate("2014-12-06T20:00:00Z"),
"data" : 4 }
{ "_id" : ObjectId("55503d77a3d32cf6295ad89c"),
"created" : ISODate("2015-12-08T20:00:00Z"),
"data" : 5 }
这条总管道:
> db.w.aggregate([
{$group:
{
_id:
{
day: {$dayOfMonth: "$created"},
month: {$month: "$created"},
year: {$year: "$created"}
},
total: {$sum: "$data"},
count: {$sum: 1}
}
},
{$sort: {count: 1}}
])
您将获得预期的结果:
{ "_id" : { "day" : 8, "month" : 12, "year" : 2015 }, "total" : 5, "count" : 1 }
{ "_id" : { "day" : 6, "month" : 12, "year" : 2014 }, "total" : 4, "count" : 1 }
{ "_id" : { "day" : 8, "month" : 12, "year" : 2014 }, "total" : 6, "count" : 3 }
我想按月分组。上个月或两个月前的所有“something”等。日期对象减去数字返回时间戳值,而不是毫秒数。您应该这样做:
lastmount=新日期(现在-lastmount)
`