I just wanted to write a preliminary post about this before gathering a 
little more data. When extending a non-abstract model (Python inheritance) 
it seems to me that a pre_delete signal registered to the parent model is 
fired when an inherited model is deleted—which would be expected. A 
pre_save signal registered to the parent model, however, does not seem to 
be firing when saving the inherited model. I am not sure if this is desired 
behavior, but it is slightly confusing.

— pre_delete registered on parent model: fired
— pre_save registered on parent model: not fired

I came upon this case when extending the djcelery PeriodicTask object. When 
creating an instance of an inheriting model, the pre_save signal was not 
sent, but the pre_delete signal did seem to be sent.

Any thoughts? I can get around this by manually registering the inheriting 
model.

aryeh

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