#10227: Support a related_default on OneToOne fields
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Reporter: rvdrijst | Owner: nobody
Type: New feature | Status: new
Component: Database layer | Version: master
(models, ORM) | Resolution:
Severity: Normal | Triage Stage: Accepted
Keywords: onetoone related | Needs documentation: 0
expection null | Patch needs improvement: 0
Has patch: 0 | UI/UX: 0
Needs tests: 0 |
Easy pickings: 0 |
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Comment (by olau):
Well, if the conceptual model is adding objects lazily, it's not really a
problem that you need to save the user profile to get your changes to
stick - they wouldn't stick otherwise. My example would never have worked
without the save if the intention was to change the name persistently.
But it's true that one would have to careful to make sure the user object
was saved so it had an id. You have the same problem if you write the code
manually, though.
I had some trouble understanding your example on the difference to the
foreign key default parameter - it seems what you are thinking about is a
zero-or-one to one mapping, not a zero-or-one to zero-to-one (that would
be related_default=None). Yes, it's less powerful in the related end in
that you can't avoid confounding null and default. But there's no way
around that. When I said relatively in line with the existing API, I just
meant that the conceptual idea of returning an in-memory object when
nothing exists yet was the same.
Thanks for looking at this, by the way. :)
--
Ticket URL: <https://code.djangoproject.com/ticket/10227#comment:27>
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