Suppose I'm building a large complex query on a Book (via the HTTP
query string -details omitted):
q = Book.objects
if year:
q = q.filter(publication_date__year=year)
if month:
q = q.filter(publication_date__month=month)
etc. (more complex queries in practice)
Now I'd like to restrict the query to books which have been printed in
'Holland':
q = q.filter(foreign_print_set__country='Holland')
where:
class ForeignPrint(models.Model):
book = ForeignKey(Book)
country = CharField()
But this is not possible on ForeignKeys. Reverse access only works for
instances, not managers.
How can I do this efficiently?
JJ.
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