#26649: Group by date_trunc (day, month, year) without extra
-------------------------------------+-------------------------------------
Reporter: tback | Owner: nobody
Type: Uncategorized | Status: new
Component: Database layer | Version: 1.10
(models, ORM) |
Severity: Normal | Resolution:
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
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Comment (by jarshwah):
Is the result you're after (not using your exact data, but the example
should be clear enough):
{{{
month count
----------------- ---------
2016-01-01 13
2016-02-01 24
}}}
If so, Django 1.10 introduces public APIs for Trunc:
https://docs.djangoproject.com/en/1.10/ref/models/database-
functions/#trunc
Your query would now be something like:
{{{
from django.db.models.functions import TruncMonth
Sales.objects
.annotate(month=TruncMonth('timestamp')) # Truncate to month and add
to select list
.values('month') # Group By month
.annotate(c=Count('id')) # Select the count of the
grouping
.values('month', 'c') # (might be redundant,
haven't tested) select month and count
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/26649#comment:2>
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