Well, books can be redefined as:
def books(self):
progs = self.programs.all()
return sum([prog.publications.all().filter(type=u'Book').count()
for prog in progs])
and likewise for the other methods.
On Mar 27, 1:27 pm, Rodrigo Culagovski <[EMAIL PROTECTED]> wrote:
> My application has the following models: Researcher, Program and
> Publication.
> Each Researcher has 0 or more Programs as a ManyToManyField, and each
> Program has 0 or more Publications also as a ManyToManyField.
> Publication has a 'type' attribute which is a CharField, and has
> choices: Book, Article or Other.
>
> I need to retrieve the number of Publications of each type for each
> Program of a given Researcher.
>
> Within the Researcher class I define:
>
> def books(self):
> count = 0
> for progs in self.programs.all():
> for pub in progs.publications.all():
> if pub.type== u"Book":
> count += 1
> return count
>
> def articles(self):
> count = 0
> for progs in self.programs.all():
> for pub in progs.publications.all():
> if pub.type== u"Article":
> count += 1
> return count
>
> def others(self):
> count = 0
> for progs in self.programs.all():
> for pub in progs.publications.all():
> if pub.type== u"Other":
> count += 1
> return count
>
> This lets me get {{ researcher_instance.books }} etc. in my templates.
> However, this seems excessively verbose and repeating oneself, and it
> seems like this problem would already have come up many times. Is
> there a more idiomatic, pythonic and djangoic way to do this?
>
> Thanks,
>
> Rodrigo
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