Cannot update a query once a slice has been taken

Question

I am trying to do this:

UserLog.objects.filter(user=user).filter(action=\'message\').filter(timestamp__lt=now)[0:5].update(read=True)

but I

Answer 1

I was getting the same error when attempting to limit the number of records returned by a queryset.

I found that if we're using one of Django's class-based generic views such as the ArchiveIndexView, we can use the paginate_by = attribute to limit the number of records.

For example (in views.py):

from django.views.generic import ArchiveIndexView
from .models import Entry

class HomeListView(ArchiveIndexView):
    """ Blog Homepage """
    model = Entry
    date_field = 'pub_date' 
    template_name = 'appname/home.html'
    queryset = Entry.objects.filter(
        is_active=True).order_by('-pub_date', 'title')
    paginate_by = 30