related: https://groups.google.com/forum/#!topic/django-users/s9qgXC4TNrA
Short answer: you can't. A raw query would be your best bet(i.e. "SELECT
SUM(a + b) AS sum FROM app_X")
On Sunday, November 23, 2014 4:42:48 PM UTC-6, Jorge Andrés Vergara Ebratt
wrote:
>
> Hello everyone,
>
> Well, the tittle says it all:
>
> I have a model X
>
> class X(models.Model)
> a = models.IntegerField()
> b = models.IntegerField()
>
> def getC(self):
> return a + b
>
>
> So, when I'm inside a template I can call {{x.getC}} and it gets the
> method for the current instance it's in, but how can I get the Sum, or Avg
> of that method? I tried doing Sum('getC') but I get the error because getC
> isn't callable in the query...
>
> Thanks in advance for the help
>
> --
> *Jorge Andres Vergara Ebratt*
> *#SoftwareDeveloper (Or at least trying to be)*
> *@javebratt*
> *facebook.com/javebratt <http://facebook.com/javebratt>*
>
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