Spring MongoDB Data - Aggregate Method

Question

Does anyone know how to convert the aggregation function below to Java code using Spring-data?

db.myCollection.aggregate([
    {$match:{"status" : {$in:["WORKING","UNASSIGNED"]}}},
    {$group:{
            _id:{
                "status":"$status",
                "queue":"$queueName"
             },
             "count":{$sum:1},
             "oldest":{$min:"$queueTime"},
             "slow":{$sum:{$cond:[
                                {$lte: ["$queueServiceTs", new Date()]},
                                        1,
                                        0]}
                          }

        }
    }
]);

Answer 1

Spring mongo does not currently support:

• Compound aggregation _idwith custom key names, although of course you can just accept the translation of the defualt field name

• Use or any expression inside , since it only supports the displayed field. $cond $sum

, - , . , $project, , .

, , :

public class CustomGroupOperation implements AggregationOperation {
    private DBObject operation;

    public CustomGroupOperation (DBObject operation) {
        this.operation = operation;
    }

    @Override
    public DBObject toDBObject(AggregationOperationContext context) {
        return context.getMappedObject(operation);
    }
}

:

    Aggregation aggregation = newAggregation(
            new CustomGroupOperation(
                    new BasicDBObject("$group",
                        new BasicDBObject("_id",
                            new BasicDBObject("status","$status")
                                .append("queue","$queueName")
                        )
                        .append("count",new BasicDBObject("$sum",1))
                        .append("oldest", new BasicDBObject("$min","$queueTime"))
                        .append("slow",
                            new BasicDBObject("$sum",
                                new BasicDBObject("$cond",Arrays.asList(
                                    new BasicDBObject("$lte",Arrays.asList(
                                        "$queueServiceTs",
                                        new Date()
                                    )),
                                    1,
                                    0
                                ))
                            )
                        )
                    )
            )
    );

$group , .