#32651: Combining Q with a Q containing Exists crashes
-------------------------------------+-------------------------------------
Reporter: Jaap Roes | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 3.2
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Jaap Roes):
I figured out why the tests results where different, for some reason
combining a `Q` with a negated `Exists` (using the `~` operator) results
in an unnegated `Exists`:
{{{
>>> q = Q() & ~Exists(Book.objects.all())
>>> q.negated
False
}}}
Setting `negated` on the constructor does work:
{{{
>>> q = Q() & Exists(Vacancy.objects.all(), negated=True)
>>> q.negated
True
}}}
This might be a separate bug.
At least I'm now able to finish the Django 3.2 upgrade.
--
Ticket URL: <https://code.djangoproject.com/ticket/32651#comment:3>
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