Get multiple list grouped by different fields - mongodb

Question

I'm using this method to send multiple list to client.
public ResponseEntity<?> getFiveLastRequestOfEachVehicleType() {
ResponseContent content = getResponseContent();
Map<String, List<Request>> map = new HashMap<>();
GroupBy groupBy = new GroupBy();
groupBy.initialDocument("vehicleTypeEnum");
query = new Query();
queryFieldsFilterLastFiveRequest(query, VehicleTypeEnum.NEISAN);
map.put("NEISAN", mongoOperations.find(query, Request.class));
query = new Query();
queryFieldsFilterLastFiveRequest(query, VehicleTypeEnum.BADSAN);
map.put("BADSAN", mongoOperations.find(query, Request.class));
query = new Query();
queryFieldsFilterLastFiveRequest(query, VehicleTypeEnum.BUJE);
map.put("BUJE", mongoOperations.find(query, Request.class));
content.setData(map);
return getReturn(content);
}
And this method apply criteria to each query
private void queryFieldsFilterLastFiveRequest(Query query, VehicleTypeEnum vehicleTypeEnum) {
query.addCriteria(Criteria.where("vehicleTypeEnum").is(vehicleTypeEnum));
query.addCriteria(Criteria.where("unlock").is(true));
query.fields()
.include("id")
.include("goodsTypeTitle")
.include("originCityTitle")
.include("price");
query.limit(5);
}
I wonder if there is any way to retrieve all list in one request to database using MongoOperations.

Answer 1

I would go to grouping manually later on, first query for all vehicleType :
private void queryFieldsFilterLastFiveRequest(Query query, VehicleTypeEnum... vehicleTypeEnum..) {
query.addCriteria(Criteria.where("vehicleTypeEnum").in(vehicleTypeEnum));
query.addCriteria(Criteria.where("unlock").is(true));
query.fields()
.include("id")
.include("goodsTypeTitle")
.include("originCityTitle")
.include("price");
query.limit(5);
}
Here the is has been changed by in, and accept a list of VehicleTypeEnum
Then to use it :
public ResponseEntity<?> getFiveLastRequestOfEachVehicleType() {
ResponseContent content = getResponseContent();
Map<String, List<Request>> map;
query = new Query();
queryFieldsFilterLastFiveRequest(query, VehicleTypeEnum.NEISAN, VehicleTypeEnum.BADSAN, VehicleTypeEnum.BUJE);
map = mongoOperations.find(query, Request.class).stream()
.collect(Collectors.toMap(r -> r.getVehicleTypeEnum().name(),r -> r));
content.setData(map);
return getReturn(content);
}
Here i use the stream api to group result by VehiculeTypeEnum name