[appengine-java] Datastore - Duplication in saving unowned one-to-one relationship

[Rodrigo Sol]

Hi,

Probably this is a newbie question, but I spent a whole day searching
for a solution without success.

I want to create an one-to-one relationships between two entities
(City and Costumer). I have a form where I create new costumers. When
I save this new costumer into the datastore a new "register" for city
is created causing one unnecessary duplication.

I am using unowned relationship and my model is above:



@PersistenceCapable(identityType = IdentityType.APPLICATION)
Class City{

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

    @Persistent
    private String nome;
    ...
}

@PersistenceCapable(identityType = IdentityType.APPLICATION)
Class Costumer{

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

    @Persistent
    private String cityKey;
    ...
}

And I am saving the Costumer class in this function:

    public void create(Costumer costumer) {
        PersistenceManager pm = Conn.get();
        try {
                pm.makePersistent(costumer);
        } finally {
            pm.close();
        }
        return errors;

    }

So, what I am doing wrong? It seems that in owned relationships this
behavior (duplicate child object) is expected, but I can not
understand why it is happening here.

I would be grateful if anyone could help?

Thanks in advance.


Rodrigo Sol

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