On Thu, Apr 08, 2021 at 11:12:51PM +0100, Roger Gammans wrote:
> On Thu, 2021-04-08 at 16:36 -0500, Ryan Nowakowski wrote:
> > On Wed, Apr 07, 2021 at 03:25:53PM +0100, Roger Gammans wrote:
> > > This is mostly (form the Django perspective) and issue with
> > > CharFields,
> > > because a CharField can store None or ''. For values of ''
> > > in CharField, IIRC, django will convert them to null, with
> > > null=True,
> > > blank=True. But not with blank=True,null=False.See also :
> > > https://docs.djangoproject.com/en/3.1/ref/models/fields/#null
> >
> > I read the documentation a bit differently. My interpretation is
> > that
> > CharField(null=True) means that both ''(empty string) and None(null)
> > are
> > valid values. But no implicit conversion from '' to None takes
> > place.
> >
> > CharField(null=False) means that None(null) isn't a valid value and
> > that
> > only ''(empty string) is permitted.
>
> I understand that reading, and the simple answer is we are both right!
>
> See:
> https://github.com/django/django/blob/45a58c31e64dbfdecab1178b1d00a3803a90ea2d/django/db/models/fields/__init__.py#L1082
>
> This shows the model field telling the any auto creating form field,
> say like in the admin model, which value to prefer 'empty' values.
>
> Since it's not the model field, so any python code which saves '' and
> None, directed onto the model will still have those respected as '' and
> NULL.
Whhhhhyyyyyyyy Oracle!!!!!!! *sigh* :)
find django/db/backends -name "features.py" | xargs grep
interprets_empty_strings_as_nulls
django/db/backends/oracle/features.py: interprets_empty_strings_as_nulls
= True
django/db/backends/base/features.py: interprets_empty_strings_as_nulls =
False
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