There are a lot of times when I just need to make sure that a result exists and perform some action according to that, but I have to call self.results.count() and check it's value. It seems like an unnecessary extra query to me. Django's querysets solve this by using queryset.exists() <https://docs.djangoproject.com/en/1.10/ref/models/querysets/#django.db.models.query.QuerySet.exists>, does haystack have an equivalent method?
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