3
骨料的要求,我想檢索來自最古老的文檔當前值的列表signed.But我沒有選擇absed在date.Thanks按日期排序與MongoDB中
這裏是一個文檔JSON:
"ad" : "noc3",
"createdDate" : ISODate(),
"list" : [
{
"id" : "p45",
"value" : 21,
},
{
"id" : "p6",
"value" : 20,
},
{
"id" : "4578",
"value" : 319
}
]
,在這裏我總的要求:
db.friends.aggregate({$match:{advertiser:"noc3", {$sort:{timestamps:-1},{$limit:1} }},{$unwind:"$list"},{$project:{_id: "$list.id", value:{$add:[0]}}});