#25339: Aggregation and annotation by time period and intervals (by month, week,
day, hour, etc)
-------------------------------------+-------------------------------------
Reporter: malefice | Owner: nobody
Type: New feature | Status: closed
Component: Database layer | Version: 1.8
(models, ORM) | Resolution:
Severity: Normal | worksforme
Keywords: QuerySet.extra | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by jarshwah):
* status: new => closed
* resolution: => worksforme
Comment:
We began talking about deprecating `.extra()` because now we have user
defined expressions that can replace (the majority of) `.extra`. See
[https://docs.djangoproject.com/en/dev/ref/models/expressions/#func-
expressions Func Expressions] specifically.
Django 1.9 will also include Day/Month/Year/Week transformations, so
you'll be able to do something similar to:
{{{
from django.db.models.lookups import MonthTransform
Sale.objects.filter(
sale_date__year=2015
).annotate(
month=MonthTransform('sale_date')
).values('month').aggregate('id')
}}}
If you find there's something you cannot do with expressions that you can
currently do with extra (with regards to SELECT), please come talk to us
in #django or post to django-users. We are already aware that extra is
still the only way to introduce custom joins.
--
Ticket URL: <https://code.djangoproject.com/ticket/25339#comment:2>
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