#26638: Allow callable in defaults argument for QuerySet.get_or_create
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Reporter: mlorant | Owner: nobody
Type: New feature | Status: new
Component: Database layer (models, ORM) | Version: master
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 1 | UI/UX: 0
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It would be nice if `get_or_create` handles callable in the `defaults`
parameter so the defaults value are not computed at each selection.
Indeed, if your default values for insertion contains selection of related
object or any long computation, it is done at each call, even if the
object can be retrieved without insertion (and so the defaults parameter
is not used).
In term of code, I would like to do something like this:
{{{
SomeObject.objects.get_or_create(
key1=value1,
key2=value2,
defaults={
'key3': long_processing_to_get_default(),
# or even
'key3': lambda: OtherModel.objects.get(pk=request.some_value)
}
)
}}}
For backward-compatibility and ease of writing, it should still accept
values that are not callables. See the patch attached (unit tests are
missing so it is not complete!)
--
Ticket URL: <https://code.djangoproject.com/ticket/26638>
Django <https://code.djangoproject.com/>
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