On Fri, Jul 26, 2013, Steve McConville <mcconville.st...@gmail.com> wrote:
>Firstly (and I don't think this is the cause of the problem) you're
>calling datetime.now() four times, which will give you four different
>datetimes (ie. the queries will not be completely identical).
Good point, I will address that.
> Secondly
>SQL uses a 3-valued logic (with null) so if any of the fields you're
>filtering on are nullable you may not be able to rely on the law of
>the excluded middle
So, if one of the fields can be Null, then *neither*:
queryset.filter(field=value)
queryset.exclude(field=value)
will match a record where it's Null?
In that case, is there a better - more reliable - way than using both .filter()
and .exclude() with the same terms to split a queryset into all those items
that match a filter, and all those that don't?
Thanks,
Daniele
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