You can create a model method (with no parameter) that can solve that, so
you can call it from the templates.
something like:
class MyObject(models.Model):
a = models.IntegerField()
b = models.Integerfield()
def miOperation(self):
return self.a + self.b
def miOtherOpertion(self):
return self.a * self.b
2014-11-24 4:21 GMT+00:00 Ethan Blackburn <[email protected]>:
> 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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