#13119: Can't pickle queryset
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Reporter: anentropic | Owner: nobody
Status: reopened | Milestone:
Component: Database layer (models, ORM) | Version: 1.2-beta
Resolution: | Keywords: querySet
pickle
Stage: Unreviewed | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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Comment (by ashchristopher):
Fail.
*sigh*
This isn't really a solution to the problem, or if it is a solution to the
problem then the documentation on Query Sets is incomplete. Either way, I
don't believe this is solved.
{{{
the_region = TripRegion.objects.all()[0]
guides = DestinationGuide.objects.active().filter(region=the_region)
}}}
This statement is valid, but will not work when pickled
{{{
pickle.dumps(guides)
TypeError::can't pickle function objects
}}}
In order to get it to work, you need to change it to:
{{{
the_region = TripRegion.objects.all()[0]
guides =
DestinationGuide.objects.active().filter(region__pk=the_region.pk)
}}}
I specifically get this problem when trying to cache query set results.
It seems weird that I would have to change the way I do a lookup depending
on whether I needed to cache the results or not.
--
Ticket URL: <http://code.djangoproject.com/ticket/13119#comment:7>
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