View Model Duplicates

Hi,

I’m struggling with fetching data from the database. When querying for a specific RFA view, I get a duplicate for each “history” entity. So with three entries in “history”, I get the same RFA three times. I found out that Hibernate has a ResultTransformer for this problem, but this isn’t useable for blazebit when I’m correct. Furthermore, I didn’t find anything helpful in the issue section. Am I missing something?

I got the following two entities:

@Entity
@Table(name = "requests")
public class RFA {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    protected long id;

    @OneToMany(mappedBy = "rfa")
    private Set<StatusEntry> history = new HashSet<>();
}

@Entity
@Table(name = "status_history")
public class StatusEntry {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    protected long id;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "rfa_id")
    private RFA rfa;

}

Views:

@EntityView(RFA.class)
public interface RFAView {

    @IdMapping("id")
    Long getId();

    Set<StatusEntryView> getHistory();
}

@EntityView(StatusEntry.class)
public interface StatusEntryView {

    @IdMapping("id")
    Long getId();

}

[j0nm1]

Ok, now it’s working fine. Thank you!

[beikov]

So what you can do is either this

        CriteriaBuilder cb = cbf.create(em, RFA.class);
        int pageIndex = 1;
        int pageSize = 10;
        int firstResult = (pageIndex - 1) * pageSize;

        EntityViewSetting<RFAView, PaginatedCriteriaBuilder<RFAView>> setting = EntityViewSetting.create(RFAView.class, firstResult, pageSize);
        setting.addAttributeSorter("createDate", Sorters.descending());
        setting.addAttributeSorter("id", Sorters.descending());
        PagedList<RFAView> l = evm
                .applySetting(setting, cb)
                .getResultList();

or this

        CriteriaBuilder cb = cbf.create(em, RFA.class);
        int pageIndex = 1;
        int pageSize = 10;
        int firstResult = (pageIndex - 1) * pageSize;

        EntityViewSetting<RFAView, PaginatedCriteriaBuilder<RFAView>> setting = EntityViewSetting.create(RFAView.class, firstResult, pageSize);
        cb.orderByDesc("createDate");
        cb.orderByDesc("id");
        PagedList<RFAView> l = evm
                .applySetting(setting, cb)
                .getResultList();