我希望将此代码片段重现为Java代码:db.getCollection('admins_comptes_client_ceov4').aggregate([{$lookup:{from:"contrats_ceov4",localField:"CUSTOMERNUMBER",foreignField:"CUSTOMERNUMBER",as:"arrayForeignObject"}{$unwind:{path:"$arrayForeignObject",preserveNullAndEmptyArrays:true}},{$replaceRoot:{newRoot:{$mergeObj

我使用聚合框架对多个字段进行分组{_id:{_id:"$_id",feature_type:"$feature_type",feature_name:"$feature_name"},features:{$push:"$features"}}它给出的结果是{_id:{_id:1,feature_type:"Test",feature_name:"Tests"},features:["23423","32423","2342342"]}但我想要这样的结果{_id:1,feature_type:"Test",feature_name:"Tests",features:["23423","3

我想在SpringBoot应用程序中获取此MongoDB查询的结果。db.getCollection('contentSource').aggregate([{$sort:{"modified":-1}},{$group:{_id:"$sourceId",cs:{$push:"$$ROOT"}}},{$replaceRoot:{newRoot:{$arrayElemAt:['$cs',0]}}}])有谁知道如何将replaceRoot添加到我的聚合中？ 最佳答案 SortOperationsortOperation=newSortO