#24065: aggregate dont find column of annotate
-------------------------------------+-------------------------------------
Reporter: mateuspadua | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.7
(models, ORM) |
Severity: Normal | Resolution:
Keywords: aggregate annotate | Triage Stage:
fielderror | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by mateuspadua):
* needs_better_patch: => 0
* needs_tests: => 0
* needs_docs: => 0
Old description:
> If we try this query, everything works normally
>
> {{{
> Entry.objects.annotate(num_authors=Count('authors')).aggregate(Avg('num_authors'))
> }}}
>
> but if we try the one below, it does not find the column
> ''authors__count' to the aggregation
>
> {{{
> Entry.objects.annotate(Count('authors')).aggregate(Avg('authors__count'))
> }}}
>
> I believe it is a problem because the exception tells us we could use the
> column ''''authors__count''''
>
> This is what the exception says:
>
> '''FieldError: Cannot resolve keyword 'count' into field. Choices are:
> email, entry, id, name, authors__count''' <- see the field here.
>
> Thanks.
New description:
If we try this query, everything works normally
{{{
Entry.objects.annotate(num_authors=Count('authors')).aggregate(Avg('num_authors'))
}}}
but if we try the one below, it does not find the column
{{{authors__count}}} to the aggregation
{{{
Entry.objects.annotate(Count('authors')).aggregate(Avg('authors__count'))
}}}
I believe it is a problem because the exception tells us we could use the
column {{{authors__count}}}
This is what the exception says:
{{{FieldError: Cannot resolve keyword 'count' into field. Choices are:
email, entry, id, name, authors__count}}} <- see the field here.
Thanks.
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Ticket URL: <https://code.djangoproject.com/ticket/24065#comment:1>
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