我正在尝试复制每个证书编号值的最新记录。我们每个证书都有多个文档,并尝试获取每个证书的最新记录并将其复制到新集合中。
数据如下:
{ "_id": ..., "certnumber":"123456", "createtime": "2024-02-03T16:42:20.324Z", "company": "A" ,.....}
{ "_id": ..., "certnumber":"123456", "createtime": "2024-02-03T16:32:20.324Z", "company": "A" ,.....}
{ "_id": ..., "certnumber":"123456", "createtime": "2024-02-02T14:28:20.324Z", "company": "A" ,.....}
{ "_id": ..., "certnumber":"123456", "createtime": "2024-02-02T13:22:20.324Z", "company": "A" ,.....}
{ "_id": ..., "certnumber":"654321", "createtime": "2024-02-05T17:42:20.324Z", "company": "B" ,.....}
{ "_id": ..., "certnumber":"654321", "createtime": "2024-02-05T16:42:20.324Z", "company": "B" ,.....}
{ "_id": ..., "certnumber":"654321", "createtime": "2024-02-03T15:32:20.324Z", "company": "B" ,.....}
{ "_id": ..., "certnumber":"654321", "createtime": "2024-02-03T14:22:20.324Z", "company": "B" ,.....}
我尝试使用以下命令收集最新记录,它有效,但只返回 2 个字段。如何提取整个文档而不是仅提取 2 个字段?
db.collectionname.aggregate(
[
{ $sort: { certnumber: 1, createtime: 1} },
{
$group:
{
_id: {certnumber : "$certnumber" },
updatedDate: { $last: "$createtime" }
}
},
],
)