Adrian Holovaty wrote:
> I'd like to add a QuerySet.exists() method, which would return True or
> False if the given QuerySet contains at least one record. This would
> be more efficient than qs.count() or len(qs) because it would perform
> the following SQL under the hood:
>
> SELECT 1 FROM [table] WHERE [where] LIMIT 1;
>
> I'm biased, because I have an immediate need for this in a project,
> but this seems general and useful enough for inclusion in QuerySet.
> Thoughts?
I often want a queryset to behave like a list in this regard:
if queryset:
# not empty, do something
If you implement it as __nonzero__ this will work more efficient than it
does now calling __len__.
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