Hello,
I am trying to use a JDO based model in conjunction with GWT's new
RequestFactoryServlet. My (example) application edits Recipes, a
Recipe owns a list of Ingredients:
@PersistenceCapable(identityType = IdentityType.APPLICATION,
detachable = "true")
class Recipe {
[...]
@Persistent
@Element(dependent = "false")
private List<Ingredient> ingredients;
[...]
public List<Ingredient> getIngredients() {
return this.ingredients;
}
public void setIngredients(List<Ingredient> ingredients) {
this.ingredients.clear();
this.ingredients.addAll(ingredients);
}
[...]
}
The RequestFactoryServlet will call setIngredients() with an updated
list of ingredients, where some new Ingredients might be included, or
the order of the elements might have changed.
Here's the problem however: The clear() call leads to JDO marking the
elements persistent-deleted and the addAll does not revert that, even
though I tried disabling the "dependent"-Option. Apparently, as soon
as I take something out of this owned list-relationship, it gets
removed from the persistence, which seems to make it impossible to re-
order the list. Why is that, and is there a way to work around it?
Thanks,
Tobias
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