#33225: Missing FROM-clause when ordering by a relationship defined on the
parent
model in a Subquery inside a negated Q
-------------------------------------+-------------------------------------
Reporter: InvalidInterrupt | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: dev
(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
-------------------------------------+-------------------------------------
Description changed by InvalidInterrupt:
Old description:
> 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.
New description:
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()` (`distinct(*fields)` may be substituted)
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#comment:1>
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