我们有两个集合，其中有用户和组织。db.users.aggregate([{$match:{"organization.metaInfo":{"$ne":"disabled"}}},{"$unwind":"$organization"},{"$group":{"_id":"$organization.organizationId","count":{"$sum":1}}},{$lookup:{from:"organisations",localField:"_id",foreignField:"_id",as:"orgDta"}},{"$project":{"_id":1,"count