#10466: Docuemtn that functions in QuerySets' parameters are eagerly evaluated.
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Reporter: liangent | Owner: nobody
Status: closed | Milestone:
Component: Documentation | Version: SVN
Resolution: fixed | Keywords:
Stage: Accepted | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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Changes (by mtredinnick):
* status: new => closed
* needs_better_patch: => 0
* component: Database layer (models, ORM) => Documentation
* needs_tests: => 0
* summary: functions as QuerySets' parameters are not lazy => Docuemtn
that functions in QuerySets' parameters are
eagerly evaluated.
* needs_docs: => 0
* resolution: => fixed
* stage: Unreviewed => Accepted
Comment:
I'm going to call this one invalid, but it does need better documentation.
The queryset's evaluation against the database is lazy. The parameter
evaluation (unless it's a database query) is done when you create the
queryset. It's fairly complicated to arrange for this to be otherwise in
all cases and rather than mess around with when it does and doesn't work,
we always have eager parameter evaluation.
I will add some documentation, but the behaviour isn't going to change.
Sorry about that. :-)
Changing the title to reflect how we'll resolve this.
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Ticket URL: <http://code.djangoproject.com/ticket/10466#comment:1>
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