我想在日期字段中使用 $ split 运算符。
[{
"status": true,
"beaconData" :{
"date" : "15/07/2017, 11:00",
"charge" : 15,
},
{
"status": true,
"beaconData" :{
"date" : "2/07/2017, 15:00",
"charge" : 35,
},
{
"status": true,
"beaconData" :{
"date" : "2/07/2017, 11:05",
"charge" : 5,
}]
我用过这样的
db.orders.aggregate([{$ project:{data:{$ split:[“$ beaconData.date”,“,”]},'status':1}}])
但错误返回
“errmsg”:“例外:无效的运算符'$ split'”,
“code”:15999,
答案 0 :(得分:2)
//$split works in 3.4 u can use $substr in ur case if ur date is always in the same format you asked
db.orders.aggregate(
[
{
$project:
{
data: { $substr: [ "$beaconData.date", 0, 9 ] }
}
}
]
)