Kueri Facet + Agregat menggunakan masalah ObjectId dengan Spring Data Mongo

Anda salah memetakan bidang id di tahap proyek dan grup.

Seharusnya _id bukan identitas. Ubah juga jenis email menjadi String. Bekerja untuk saya.

GroupOperation groupOp = Aggregation
            .group("firstName", "lastName", "email", "status", "_id")
            .addToSet("department").as("department").addToSet("address").as("address");

ProjectionOperation projectStage = Aggregation.project("firstName", "lastName", "email", "status", "department", "address", "_id");

...

AggregationResults<EmployeeOutFacet> EmployeeOutList = mongoTemplate.aggregate(aggregation, mongoTemplate.getCollectionName(Employee.class), EmployeeOutFacet.class);