#16439: select_related does not work with nullable fields unless field is
specified.
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Reporter: dloewenherz | Owner: nobody
Type: Bug | Status: closed
Component: Documentation | Version: 1.3
Severity: Normal | Resolution: fixed
Keywords: db | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 1
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by mtredinnick):
* status: new => closed
* resolution: => fixed
Comment:
Quoting from the current documentation
(https://docs.djangoproject.com/en/dev/ref/models/querysets/#django.db.models.query.QuerySet.select_related):
Note that, by default, select_related() does not follow foreign keys
that have null=True.
So no documentation patch required. The reason it's like this is because
nullable joins require an outer join between tables and is sufficiently
performance impacting to not do by default.
--
Ticket URL: <https://code.djangoproject.com/ticket/16439#comment:5>
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