Пример #1
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 class TestObject(PersistentObject):
     collection = Collection(cascade_delete=True)
Пример #2
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 class TestObject(PersistentObject):
     collection = Collection()
Пример #3
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        class TestObject(PersistentObject):

            parent = Reference(bidirectional=True)

            collection = Collection(cascade_delete=True, bidirectional=True)