#2430: QuerySet should be evaluated when used in boolean tests
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Reporter: ubernostrum | Owner: mtredinnick
Status: reopened | Component: Database wrapper
Version: SVN | Resolution:
Keywords: | Stage: Accepted
Has_patch: 0 | Needs_docs: 0
Needs_tests: 0 | Needs_better_patch: 0
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Comment (by mtredinnick):
Using an extra SQL query is not the way to go here; what if the query is
time consuming?. We already have the result set. We just need to read the
first row (in the cases where "rowcount" is not honoured on cursors) and
if we get data back, cache it and remember to add it to future retrievals.
A little fiddly, but not impossible and imposes no extra database load.
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Ticket URL: <http://code.djangoproject.com/ticket/2430#comment:6>
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