Standart problem situation:
class Parent { ... IList<Child> childList; ... }
And
class Child { ... Parent parent; ...}
Parent contains list of childs. I can manipulate childs lifecycle using "cascade" attribute in parent mapping definition. Using this I can, for example, delete child just by removing it from childList list.
But what if I want to remove child in situation where I have no reference to its parent and therefore to parent's childList? Session.Remove(childInstance) don't work. It works only if I delete childInstance from childList manually.

Very often I need to iterate through childLists of many parents (they are all detached) and I would like to delete some childs from these lists during iteration. But this is not possible because lists cannot be changes during iteration. So I have to store appropriate parents and childs to perform removing from childLists after iteration. It would be cool if everything I need to do is to write something like this: childInstance.Parent = null and then reattach parents and their childs to session and write session.delete(childInstance). Is that possible?

Should be ... what do you mean with ? Do you get an exception or is the object simply still there ?

Can you post the mappings and the code where you delete the child (code between session.BeginTransaction and session.Commit() or between session obening and flushing) ?

Objects are still there - nothing happens, no exeptions. I read that I should delete object itself and its reference in parent collection...







I delete the child on offline client just adding it to the collection. Then I pass this collection on server and call Session.Delete for each element in this collection. Ids are guids, so I guess hnibernate can attach childs by guid-id and then just to delete it. But nothing happens. It only works when on the same transaction I update attached parents with deleted childs in their child collections.

I suppose you've tried some of these already, but to rule them out:

- use a uni-directional mapping instead of the bi-directional, e.g. no parent on the child
- set the parent to null before delete.

Have you checked the debug log. Is there anything about the deletion request ?

I'm afraid I won't be able to reference parent from child instance in business code. Or I'm mistaken?


I tried bit didn't help


no deletion there (((