如何解决spring mongo 在聚合查询中获取 sum.size
以下是示例数据：
db.infos.find()
{
"groupId": "1111","customerId": "A100","tracks": [{
"trackId": "234","infos": [{
"location": {
"address": "street1","city": "test","country": "US"
}
},{
"location": {
"address": "street2",{
"location": {
"address": "street3","country": "US"
}
}
]
}]
}
{
"groupId": "2222","tracks": [{
"trackId": "345","infos": [{
"location": {
"address": "street4",{
"location": {
"address": "street5","tracks": [{
"trackId": "666","country": "US"
}
}
]
}]
}
我们正在使用 spring mongo。我们如何将此查询转换为 spring mongo（计数部分）？ db.infos.aggregate([ { $unwind: "$tracks" },{ $group: { "_id": {"groupId":"$groupId","customerId":"$customerId"},"count": {"$sum": { "$size": "$tracks.infos" } } } } ])
List<Aggregationoperation> operations = new ArrayList<>();
operations.add(Aggregation.unwind("tracks"));
Fields groupedGroupAndCustomerId = Fields.fields("groupId","customerId");
operations.add(Aggregation.group(groupedGroupAndCustomerId)...?
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