#24833: Annotation with `Case` can't be used with `exclude`
-------------------------------------+-------------------------------------
Reporter: coolRR | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.8
(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
-------------------------------------+-------------------------------------
Changes (by coolRR):
* needs_better_patch: => 0
* needs_tests: => 0
* needs_docs: => 0
Old description:
> n use `.filter` on it but you can't use `.exclude`. (You get various
> exceptions about `.null` and `.get_col` not existing.)
>
> Example:
>
> {{{
> def my_view(request, *args, **kwargs):
> things = models.Thing.objects.all().annotate(
> bar=django.db.models.Case(
> django.db.models.When(
> foo='foo',
> then=django.db.models.Value('bar')
> ),
> default=django.db.models.Value('baz'),
> output_field=django.db.models.CharField()
> )
> )
>
> print(things.filter(bar='bar')) # This one works
> print(things.exclude(bar='bar')) # This one doesn't
> return django.http.HttpResponse(str(things))
> }}}
>
> Full working example attached to this ticket. (Simply run `migrate`, then
> `runserver`, then access the root URL to see the Django debug page for
> the exception.)
New description:
When you define an annotation that uses `Case`, you can use `.filter` on
it but you can't use `.exclude`. (You get various exceptions about `.null`
and `.get_col` not existing.)
Example:
{{{
def my_view(request, *args, **kwargs):
things = models.Thing.objects.all().annotate(
bar=django.db.models.Case(
django.db.models.When(
foo='foo',
then=django.db.models.Value('bar')
),
default=django.db.models.Value('baz'),
output_field=django.db.models.CharField()
)
)
print(things.filter(bar='bar')) # This one works
print(things.exclude(bar='bar')) # This one doesn't
return django.http.HttpResponse(str(things))
}}}
Full working example attached to this ticket. (Simply run `migrate`, then
`runserver`, then access the root URL to see the Django debug page for the
exception.)
--
--
Ticket URL: <https://code.djangoproject.com/ticket/24833#comment:1>
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