[appengine-java] strange behavior of one-to-one owned (one-direction) relationship

Wed, 23 Sep 2009 01:16:44 -0700

Hi everybody,

I'm trying to model a one-to-one owned (one-direction) relationship, where the owned object (Stat) is created inside the owner (User).

-----------------------------------
public class User implements IsSerializable {

    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    @Extension(vendorName="datanucleus", key="gae.encoded-pk", value="true")
    private String encodedKey;

    @Persistent
    private String userId;

    @Persistent
    private Stat stat= new Stat();

    public User() {}

    public String getEncodedKey() {
        return this.encodedKey;
    }

    public void setEncodedKey(String encodedKey) {
        this.encodedKey = encodedKey;
        stat.setEncodedKey(KeyFactory.keyToString(KeyFactory.stringToKey(encodedKey).getChild(Stat.class.getSimpleName(), userId)));
    }

    public void setUserId(String userId) {
        this.userId = userId;
        stat.setUserId(userId);
    }

    public String getUserId() {
        return userId;
    }

    public void updateStat(long number) {
        stat.updateStat(number);
    }

    public Stat getStat() {
        return stat;
    }
}
----------------------------

this implementation however produces a strange behaviour.
Every time I try to access the User entity a new Stat object is created into the datastore:
For example this call will create an object even if the user object doesn't exist:

User user = pm.getObjectById(User.class, userEncodedKey);

Am I using the one-to-one relationship in a wrong way???

Thanks

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to [email protected]
For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en
-~----------~----~----~----~------~----~------~--~---

Reply via email to