How to display the last 3 objects in Django?

Question

Django

Hello.
Task: display on page 3 the latest reviews related to this article.

mentionship = Mention.objects.filter(mentionn_id = step_id)[-3:0] #Не работает

There are no problems with positive ones, but Django does not support negative indexing. How to be?

Answer 1

Mention.objects.filter(mentionn_id=step_id).order_by('-pk')[:3]

Where in order_by you put a field with a minus (in descending order), by which you need to select these very last ones. pk is an alias to the primary key. If you did not change it, this is the ID.
Boyczuk :

If no such ordering is defined for a given QuerySet, calling reverse() on it has no real effect

Answer 2

mentionship = Mention.objects.filter(mentionn_id = step_id)
mentionship_last3 = mentionship[mentionship.count()-3:]

And from the docs:
https://docs.djangoproject.com/en/dev/ref/models/q...
mentionship_last3 = mentionship.reverse()[:3]