I read in another thread (http://forum.hibernate.org/viewtopic.php?t=957657) that "A list is an indexed bag", which makes perfect sense. But when an item occurs more than once in a list, and I try to delete one of those occurrences by removing it from the list then updating the list's container with
NHibernate then throws an exception:


In the mapping file, the list's cascade attribute is set to "all-delete-orphan":


What am I getting wrong here?


Hibernate version:
version 1.2.0.GA

Name and version of database:

SQL Server 2005 Express, Service Pack 2

It seems I've already solved the problem. I just changed the cascade attribute to "save-update". The reason I had set it to "all-delete-orphan" to begin with, was that I want the SampleItem to be deleted if orphaned. However, "orphaned" in this case pertains to two parent entities: SampleListContainer and another one. I don't think NHibernate supports such semantics directly. So now after updating the deleted item's container, I check whether or not the item still exists in either of the parents and delete it using
if not.