post_delete and determining if a related object has been deleted

Hey guys,

the post_delete signal is fired before the PK field of the deleted and
all related objects is set to None. This leads to the situation that
one can't determine if a related object has been deleted in a
post_delete handler.

Here's an example:

"Order", "Item" and "LogEntry" are the models. Item has a foreign key
to Order, and LogEntry has a foreign key to Order.

When an Item object is deleted, a new LogEntry object shall be created
and attached to the Item's related Order object.

If the Order object itself is deleted, all post_delete handlers of all
related objects are fired, including Item. Item however stores a new
object with a relation to the *deleted Order* object, which will
result in a constraint error (at least when using transactions in
PostgreSQL, which I do).

pre_delete is no option for me, as the proper objects really have to
be gone in order for the operations to work.

I can see that the behavior has changed 8 years ago:
https://code.djangoproject.com/ticket/5559

Is there any other option I'm missing?

Many greetings,
Stefan Schindler

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