It's possible to orphan a child object, but only if you delete the parent
entity. The reason is that the parent path information is stored in the key
of the child object:
http://code.google.com/appengine/docs/java/datastore/queriesandindexes.html
On Sun, Nov 15, 2009 at 9:28 PM, ascetik <asce...@gmail.com> wrote:
> Is is possible to update a child object directly(never calling the
> parent) and still reliably keep the 'owned one to many' relationship?
> I have been doing this on one of my apps and then noticed that the
> children will sometimes become orphaned from the parent. I'm trying to
> track down the problem but it occurred to me that this may be messing
> up the index or something strange like that.
>
> Does this make sense or should i elaborate more?
>
> the structure is similar to:
>
> public class UserObj {
> @PrimaryKey
> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> private Long id;
> @Persistent
> private List<VehicleObj> Vehicles;
> public Long getId() {
> return id;
> }
> public void setId(Long id) {
> this.id = id;
> }
> public List<VehicleObj> getVehicles() {
> return Vehicles;
> }
> public void setVehicles(List<VehicleObj> vehicles) {
> Vehicles = vehicles;
> }
>
> }
>
>
> ....
> later on I update one of the VehicleObj's based on a search without
> ever instantiating the parent UserObj and every so often i loose a
> vehicle that should be attached to the UserObj. It's still in the
> datastore just orphaned.
>
> This may not be the problem but i thought it was a good place to start
> tracking it down.
>
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>
--
Ikai Lan
Developer Programs Engineer, Google App Engine
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