#9573: template filter length() should call .count() on querysets
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Reporter: wam | Owner: nobody
Status: reopened | Milestone:
Component: Database layer (models, ORM) | Version: 1.1
Resolution: | Keywords:
Stage: Unreviewed | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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Changes (by miracle2k):
* status: closed => reopened
* resolution: wontfix =>
* version: 1.0 => 1.1
* component: Template system => Database layer (models, ORM)
Comment:
I just stumbled across this; For some reason I always assumed that {{
queryset|length }} would do a count() when possible.
Couldn't this be handled inside the ORM? I.e. __len__ doing a count()
query for as of yet unexecuted querysets, and continuing to fetch the
remainder of the result if the queryset was already touched?
Clearly there is the downside of running an extra query in cases where the
result is pulled later on anyway, but it may be worth the compromise.
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Ticket URL: <http://code.djangoproject.com/ticket/9573#comment:2>
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