I can confirm this issue on Django 1.11.15 (Python 3.4.3, MySQL 5.5.61).
Calling 'last()' on a slice produces wrong result:
>>> News.objects.all().order_by('id')[:5].values('id')
<QuerySet [{'id': 1}, {'id': 2}, {'id': 3}, {'id': 4}, {'id': 5}]>
>>> News.objects.all().order_by('id')[:5][4].id
5
>>> #But calling 'last' gives us wrong id:
>>> News.objects.all().order_by('id')[:5].last()
11
понедельник, 24 сентября 2018 г., 13:49:08 UTC+2 пользователь Shivam Jindal
написал:
>
> Hi,
>
> I am making a queryset by slicing it to return only first 2 objects but
> When I am using .last() on this queryset then it is not applying slicing
>
> Pharmaceutical.objects.order_by('id').values('id')
> >>> [{'id': 2L}, {'id': 3L}, {'id': 4L}, {'id': 5L}]
>
> >>> Pharmaceutical.objects.order_by('id')[:2].values('id')
> [{'id': 2L}, {'id': 3L}]
>
> >>> Pharmaceutical.objects.order_by('id')[:2].values('id').last()
> {'id': 5L} # But this should be 3
>
> --
> Thanks,
>
> Regards
> Shivam Jindal
> +91 8586896112
>
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