#23662: QuerySet __nonzero__, __len__ cause queryset evaluation
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Reporter: smishlayev | Owner: nobody
Type: | Status: new
Cleanup/optimization | Version: 1.7
Component: Database layer | Resolution:
(models, ORM) | Triage Stage:
Severity: Normal | Unreviewed
Keywords: | Needs documentation: 0
Has patch: 1 | Patch needs improvement: 0
Needs tests: 0 | UI/UX: 1
Easy pickings: 0 |
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Comment (by tchaumeny):
In my opinion, that could almost be considered as a backward incompatible
change as people might rely on the fact that doing `len(qs)` followed by
`for ... in qs:` will only perform one query (which is important on
Postgres as a `COUNT(*)` query is rather expensive). Same goes for
`bool(qs)`.
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Ticket URL: <https://code.djangoproject.com/ticket/23662#comment:4>
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