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kyle-eshares/count.py

Last active October 17, 2016 20:05
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count.py
# Don't waste a query if you are using the queryset
books = Book.objects.filter(..)
if len(books) > 5:
do_stuff_with_books(books)
# If you aren't using the queryset use count
books = Book.objects.filter(..)
if books.count() > 5:
do_some_stuff()
# But never
if len(Book.objects.filter(..)) > 5:
do_some_stuff()
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