When one tests for the boolean value of a queryset in the following way:
examples = Example.objects.all()
if examples:
..... do something
You might think (I did) that Django will call a __nonzero__ special
attribute that would either execute an EXISTS SQL STATEMENT or a SELECT
statement with a LIMIT of 1. Instead, the ORM evaluates the entire
queryset through the __len__ attribute.
Is there a best practice for working around this?
Thanks,
Adam
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