How to implement an unowned one-to-many relationship in Siena/GAE

[Willem Salembier]

The documentation explains Many<T> relations implemented as owned, aggregated or embedded relationships.

But how do I implement an unowned one-to-many relation?

In GAE, this implemented by storing a List<Key> objects in the parent object. The child object represented by a Key has its own lifecycle.

In Siena I can't use

- owned -> because it requires a link from the child to the parent back

- aggregated -> because child and parent are one entity group and the child gets duplicated

- embedded -> because i can't query this structure natively in GAE because it is represented as a YAML string.

Any suggestions?

[Pascal Voitot Dev]

Hi,

You can't use List<Key> in Siena because Siena abstracts the GAE Key type.
But you can store directly a List<Long> where the long is the ID of the linked entity.

It should be work without any pb!

Pascal

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[Willem Salembier]

This is an option, but not a pretty one because I loose the retrieval of the linked entities using Many.asList() or asQuery().

I was hoping I could define something like this:

@Referenced

Many<T> relations;

so SIENA on GAE whould persist this relation as a List<Long> or List<Key>

[Pascal Voitot Dev]

yes it would be great but it's not implemented like that, yet :)
Sorry...
If you feel like doing this work, don't hesitate to contribute (as I said several times, I don't have time to support Siena anymore as I work a lot on other stuff :( )

Pascal

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