考虑以下作为聚合管道输出的文档:
{ "_id" : 1,"results" : [
{ "status" : "HOLD","footage" : 43.01,"pieces" : 1 },{ "status" : "accEPTED","footage" : 80.90,"pieces" : 2 },{ "status" : "REJECTED","footage" : 40.00,"pieces" : 1 }
]}
我正在尝试创建将状态与镜头和片段字段连接起来的自定义键,结果:
{ "_id" : 1,"results" :
{
"HOLD_footage": 43.01,"HOLD_pieces":1,"accEPTED_footage": 80.90,"accEPTED_pieces": 2,"REJECTED_footage":40.00,"REJECTED_pieces":1
}
}