Alex, Good thought. Not as crisp as I would like, but it should do the trick.
Thanks, Dave On Mar 24, 6:18 pm, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: > How about recent_authors = Author.object.filter(book__pk__in=[b.pk for > b in recent_books]).distinct() > > That can probably be done without the list comprehension but this > should work. > > On Mar 24, 7:23 pm, davenaff <[EMAIL PROTECTED]> wrote: > > > This seems like something that should be doable, but I can't seem to > > make it work. > > > Consider an example with these models: > > > class Book(models.Model): > > author = models.ForeignKey(Author) > > publisher = models.ForeignKey(Publisher) > > pub_date = models.DateTimeField() > > is_hardcover = models.BooleanField() > > pages = models.IntegerField() > > > class Author(models.Model): > > name = models.CharField(...) > > > class Publisher (models.Model): > > name = models.CharField(...) > > > I want to get a list of all of the books, authors and publishers that > > were published in 2005 in hardcover with over 300 pages. So, this is > > an easy queryset to create: > > > recent_books = Book.objects.filter(pub_date__year='2005', > > is_hardcover= True, pages>300) > > > and I know that I can get them this way: > > recent_authors = > > Author.objects.filter(book__pub_date__year='2005',is_hardcover= True, > > pages>300) .distinct() > > recent_publisher = > > Publisher.objects.filter( book__pub_date__year='2005',is_hardcover= > > True, pages>300).distinct() > > > but that isn't very DRY. > > > I would like to be able to do something like: > > recent_authors = Author.objects.filter(book in recent_books) > > > Can an equivalent be done? How would you do it? Or alternatively, how > > would you keep this code DRY? > > > Thanks in advance, > > Dave --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
