如何计算 Django 中的过滤结果？

Question

I have managed to create a QuerySet of what I want so far, but I am unable to include the .count () statement in it. I do know that I can use len (students) , but I would like to stick to the Django ORM.

student_count = Student.objects.filter(last_online__range=[last week, this week])

How do I do that?

Answer 1

you can use aggregate() to count, like this:

student_count = Student.objects.filter(last_online__range=[last week, this week]).aggregate(Count('MODEL_FILE'))

The function of Django's aggregate() method is to perform statistical calculations on a set of values (such as a field of the queryset) and return the statistical calculation results in a dictionary (Dict) format.

Answer 2

You can use count()

Student.objects.filter(last_online__range=[last week, this week]).count()