Changes to multiple entities within a single transaction

Question

Hy,

I am trying to make changes to multiple entities within a single transaction in app engine platform. As I understand in order to succeed doing so, App Engine needs to know in advance which entities will be updated together, so it knows to store them in a way that supports transactions. And therefore, user must declare that an entity belongs to the same entity group as another entity when you create the entity.

How do I declare that one entity belongs to another entity group in creation time?

Thanks,

Nati

Answer 1

Using parent argument to model constructor