it would probably be better to use a custom "Func"[1] and a custom "Query
Expression" [2] than user QuerySet.extra

[1] https://docs.djangoproject.com/en/1.9/ref/models/database-functions
[2] https://docs.djangoproject.com/en/1.9/ref/models/expressions/



On Mon, May 23, 2016 at 11:16 AM, Ketan Bhatt <ktb...@gmail.com> wrote:

> Take a look at the `extra` method of the queryset in Django. It allows you
> to do what you are trying to do by raw SQL.
>
>
> https://docs.djangoproject.com/en/1.9/ref/models/querysets/#django.db.models.query.QuerySet.extra
>
> Check the above link, the example with `annotate` will be interesting for
> you.
>
> I think your aim should be to create a new field and then do a `order_by`
> and `first`.
>
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