Ian-
Thanks a lot for your reply. The error message detail is 'Object with
id "agp0cnV4bWFwcGVychkLEgdUd2VldGVyIgxrZXlkb3NhdHJ1Y2sM" is managed
by a different Object Manager.'
The objects aren't being handled by any other method except the
addTrucks method in my DAO. They are never added to the datastore.
I've changed the code around a bit. I'm now assigning keys using a
unique id. Tweeter now looks like...
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
@Extension(vendorName="datanucleus", key="gae.encoded-pk",
value="true")
private String encodedKey;
@Persistent
@Extension(vendorName="datanucleus", key="gae.pk-name",
value="true")
private String keyName;
....
@Persistent(mappedBy = "tweeter")
@Order(extensions = @Extension(vendorName="datanucleus",
key="list-
ordering", value="key ASC"))
private List<Truck> trucks;
and Truck:
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
@Extension(vendorName="datanucleus", key="gae.encoded-pk",
value="true")
private String encodedKey;
@Persistent
@Extension(vendorName="datanucleus", key="gae.pk-name", value="true")
private String keyName;
....
@Persistent(dependent = "true")
private Tweeter tweeter;
I have a feeling that I'm just not modelling the situation correctly.
The case would more accurately be defined as N-1, because I will never
access the List of Trucks stored in the Tweeter object.... I only want
to access the Tweeter object stored in each truck. It really seems
like it should be very simple.
Thanks alot!
On Sep 27, 1:18 am, Ian Marshall <ianmarshall...@gmail.com> wrote:
> Two things....
>
> 1. More importantly, what is the detail of your
> javax.jdo.JDOUserException, and what is your code that is associated
> with this exception?
>
> 2. I personally use bi-directional relationships between parent and
> children. So in your case, you could add to your Tweeter class:
>
> @Persistent(mappedBy="tweeter")
> @Element(dependent="true")
> @Order(extensions = @Extension(vendorName="datanucleus", key="list-
> ordering", value="key ASC"))
> private ArrayList<Truck> liTrucks = new ArrayList<Truck>();
>
> but you might want to omit the "@Element" line.
>
> On Sep 26, 11:07 pm, culov <cul...@gmail.com> wrote:
>
>
>
> > I'm looking to tighten up some of my server-side code, but I'm having
> > trouble properly establishing the relationship between entities.
> > Before, I was using unencoded Strings as keys, but after reading the
> > documentation here, I've changed them to encoded app-generated
> > Strings.
>
> > I have two Entities, Trucks and Tweeters. What I'd like is an
> > accessible Tweeter inside every Truck. Every truck has to have a
> > Tweeter associated with it (there may be many Trucks with the same
> > Tweeter), but a Tweeter may have no Trucks. Thus, the Tweeter should
> > be the parent, and the Truck the child. I'm having lots of trouble
> > persisting the classes in the datastore and I'm hoping someone can
> > look over how I created the classes and detect my errors. Currently im
> > getting a javax.jdo.JDOUserException. When I try to persist a Truck
> > object. Here's the relevant portion of my child class, Truck:
>
> > @PrimaryKey
> > @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> > @Extension(vendorName="datanucleus", key="gae.encoded-pk",
> > value="true")
> > private String key;
> > ....
> > @Persistent(defaultFetchGroup = "true")
> > private Tweeter tweeter;
> > and the parent, Tweeter:
>
> > @PrimaryKey
> > @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> > @Extension(vendorName="datanucleus", key="gae.encoded-pk",
> > value="true")
> > private String key;
> > I never set any of the keys anywhere, and based on the logs, the keys
> > are being set as they should be. I think there must be a critical
> > misunderstanding of the relationship on my part thats leading me to
> > see an error regardless of what I try. I know I can use
> > com.google.appengine.api.datastore.Key, but my classes are also used
> > client-side by GWT, so I can't import the Key class from the GAE
> > library.
>
> > Thanks so much for the help!
--
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 google-appengine-j...@googlegroups.com.
To unsubscribe from this group, send email to
google-appengine-java+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/google-appengine-java?hl=en.
