#24254: Passing a query to "pk__in" of another query may result in invalid SQL
-------------------------------------+-------------------------------------
Reporter: bronger | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.7
(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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Old description:
> Consider the following models:
>
> {{{
> from django.db import models
>
> class Father(models.Model):
> name = models.CharField(max_length=200)
>
> class Son(Father):
>
> class Meta:
> ordering = ("name",)
> }}}
>
> Then, the following query:
>
> {{{
> Son.objects.filter(pk__in=Son.objects.all().distinct()[:10])
> }}}
>
> results in an invalid SQL query. SQLite complains with "only a single
> result allowed for a SELECT that is part of an expression".
New description:
Consider the following model:
{{{
from django.db import models
class MyModel(models.Model):
name = models.CharField(max_length=200)
class Meta:
ordering = ("name",)
}}}
Then, the following query:
{{{
MyModel.objects.filter(pk__in=MyModel.objects.all().distinct()[:10])
}}}
results in an invalid SQL query. SQLite complains with "only a single
result allowed for a SELECT that is part of an expression".
--
Comment (by bronger):
You're right, my example was not minimal. I changed it so that only one
model is defined.
--
Ticket URL: <https://code.djangoproject.com/ticket/24254#comment:2>
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