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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