mongodb展开数组数据

核心是$unwind操作

db.getCollection("orders").aggregate(
[
{$unwind:"$OrderTrackingDetails"},
{$match:
{
"OrderNumber":{"$in":["orderNumber"]},
"OrderTrackingDetails.ActionCode":"Delivered"
}
},
{$project:
{
"_id":0,
"CreateOn":1,
"OrderNumber":1,
"TrackingNumber":1,
"TrackingStatus.Name":1,
"OrderTrackingDetails.Description":1,
"OrderTrackingDetails.TrackingDateTime.DateTimeString":1,
"OrderLogisticsServiceCode":1,
"OrderLogisticsType.Name":1,
"Country":1
}
}
])