strange problem deleting objects

Hi!,
I've overrided the save() method of one of my ModelForms and I'm
performing a delete of some related objects depending on some form
fields values. The thing is I'm getting differents behaviours
dependening on how the deletion is performed, consider:

1) self.instance.delete()
2) MyModel.objects.get(pk=self.instance.pk).delete()

I'm listening the post_delete of self.instance class, in there I
create a "dependency graph" of their related objects. The problem is
that at some point I'm retriveing self.instance like:
MyRelatedModel.self_instance_related_name and with the first (1)
delete method I can still access to self.instance but with the second
(2) delete method i'm getting a DoesNotExist.

Why it's different?

Thanks!
--
Marc

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