Map (apply function) Django QuerySet

Question

Is there a mechanism to map Django QuerySet items not triggering its evaluation?

I am wondering about something like Python map. A function that uses a function to apply it over the QuerySet, but keeping the lazy evaluation.

For example, using models from Django documentation example, is there something like? (not real code):

>>> Question.objects.all().map(lambda q: q.pub_date + timedelta(hours=1))

which keeps the lazy evaluation?

Answer 1

Just working through something like this myself. I think the best way to do it is to use a python list comprehension.

[q.pub_date + timedelta(hours=1) for q in Question.objects.all()]

Then Django takes care of optimizing this as it would any other query.