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

Your code is incorrect because of where the slicing happens. It should happen after the call to update(), not before.

Wrong:

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

Right:

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