#24386: Querysets with filters and exclusions based on deep relations build
invalid
queries
-------------------------------------+-------------------------------------
Reporter: rtpg | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by charettes):
To find the oldest active employees for each owner you could use a
combination of `DISTINCT ON` and `ORDER BY`:
{{{#!python
Employee.objects.filter(status='active').order_by('owner',
'start_time').distinct('owner')
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/24386#comment:3>
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