#33225: Missing FROM-clause when ordering by a relationship defined on the
parent
model in a Subquery inside a negated Q
-------------------------------------+-------------------------------------
Reporter: | Owner: nobody
InvalidInterrupt |
Type: Bug | Status: new
Component: Database | Version: dev
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
I encountered the following error in 3.2, and produced this test case
against main (`551c997f`) today; using the postgres backend for all tests.
Using the models from `tests.model_inheritance_regress.models`, when
running:
{{{
list(
ItalianRestaurant.objects.filter(
~Q(
supplier__pk__in=Subquery(
ItalianRestaurant.objects.filter(pk=OuterRef('pk'))
.order_by('serves_gnocchi')
.values('pk')
)
)
)
)
}}}
ProgrammingError is raised, due to a missing JOIN of
`model_inheritance_regress_restaurant`.
This is as much as I was able to reduce the test case. In particular, the
following seem necessary to encounter the error:
* The negation of the Q object
* The `__in` lookup passing through a relationship defined on the parent
model
* The `filter()` on an `OuterRef`
* The use of `order_by()`
The error also occurs if `values('supplier__pk')` is used as would be
semantically correct.
When debugging, it appeared that the inner `Query` object had a refcount
of zero for the alias in question, but I may have misunderstood what was
happening there.
--
Ticket URL: <https://code.djangoproject.com/ticket/33225>
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