MongoDB+Spring: Query Get Object without @DBRef referenceObjects

Question

I am trying to query object without nested reference using Spring and mongo DB. For instance

@Document
public class A {
    @Id
    private String id;
    private String data;
    @DBRef
    private B b;
}

@Document
public class B {
    @Id
    private String id;
    private String data;
}

I want to get A object without reference. Querying A

public List<A> getAllA(String id) {
    Query query = new Query();
    query.addCriteria(Criteria.all());
    List<A> aList = null;
    aList = mongoOperations.findOne(query, A.class);
    return aList;
}

Returns, I don't want to get nested b object:

[{
    "_id": "AId..",
    "data": "Adata..",
    "b":{
        "id":"BId..",
        "data":"Bdata"
    }
}]

Answer 1

Exclude fields.

Query query = new Query();
query.addCriteria(<query criteria>);
query.fields().exlude("b");