Hi,
I'm having trouble getting JDO work in a situation of wanting to
transfer child objects from one parent to another. Let's say that I
would like to model an object called "Team" and an object called
"Player". A Player can be on only one team at a time, and a Team can
have many Players. I can get the basics working, however I run into
problems when I want to transfer ("trade") an existing Player instance
to an existing Team instance. Outside of that relationship, the
objects are completely different.
I have the problem that a child cannot be moved because apparently it
isn't in the same entity group. I have tried to model it as Set<Key>
in each class like the Favorite Foods example in the documentation,
but that doesn't work. I don't get errors, but nothing is saved. The
Sets saved are always empty. I have tried the same thing with
ArrayList<Long>, where Long is the Key.getId() of the related
object.
I think I am missing something rather simple, but I can't get it
working. Do I need other annotations? Can someone post a simple
example?
thanks!
Max
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