@DBref + QueryDslPredicateExecutor

Sources:
GadgetRepository

Code:

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@Repository(value = "gadgetRepository")
public interface GadgetRepository extends CrudRepository<Gadget, String>, QueryDslPredicateExecutor<Gadget> {
}

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Gadget

Code:

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@XmlRootElement
@Document(collection="gadget")
@PersistenceCapable
public class Gadget {
    @Id
    private String id;

    private String url;

    private Long timestamp;

    @DBRef(collection="status")
    private Status status;

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GadgetService

Code:

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QGadget gadget = QGadget.gadget;
       
        BooleanBuilder expressionBuilder = new BooleanBuilder();
        if (StringUtils.hasText(status)) {
            expressionBuilder.and(gadget.status.name.equalsIgnoreCase(status));
        }

        return (List<Gadget>) gadgetRepository.findAll(expressionBuilder);

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Code:

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gadgetService.getGadgets("APPROVED");

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returns 0.

What is my mistake?