How to delete a OneToOneField reverse relation?

[Evan Heidtmann]

My question is very similar to one by Seth Gordon in 2011. But it's been 4 years since then, so I'll try again.

I have models A and B, and B has a O2O field pointing to A. When I do `a.b.delete()`, then I'm surprised to find that `a.b` is still a valid object. How can I modify `a` so that it returns to its expected state (i.e. `a.b` throws B.DoesNotExist)?

Repro app & project here:

https://github.com/ezheidtmann/o2o_delete_confusion

Models in question:
https://github.com/ezheidtmann/o2o_delete_confusion/blob/master/maybebug/models.py

Tests showing what I've tried:
https://github.com/ezheidtmann/o2o_delete_confusion/blob/master/maybebug/tests.py

You can see I've tried reloading the entire model from the database -- it works, but I am looking for something that takes less time and has fewer side-effects. Is there some way to reset the local cache in the Thing object?

Thanks a lot!

Evan

[James Schneider]

I believe that delete() only deletes the reference to the object in the database, but does not affect the calling object in memory.

I think the reason for this is so that you can perform a delete operation, and if successful,  gather information about the deleted object to display a confirmation message to the user (which may be computationally expensive, so you wouldn't want to run it unless the operation was successful). You would need to reload the parent object again for the deletion to be effective from a Python/Django perspective, similar to what you do at the end of your test code.

-James

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