Thanks a lot! Before posting I have spent over an hour reading and rereading that particular page in the doc section and in the Djangobook but still somehow the concept eluded me. I do admit though that I do not have previous experience solving this sort of issues in other languages. Maybe adding a real use case to the doc could make it easier to grasp.
And other related question: where it would be more logically correct to put this code? In URLConf as an parameter for the view, in a view of its own, or in a method bound to the Book model? On Feb 8, 6:24 pm, "Jacob Kaplan-Moss" <[EMAIL PROTECTED]> wrote: > On 2/8/08, coldpizza <[EMAIL PROTECTED]> wrote: > > > Given that I have a Book model with a ManyToManyField called authors > > how do I get all the books for a particular author? Each book may have > > more than one author, so I cannot filter the books using the standard > > methods. > > You'll want to more closely read the documentation on related object > lookups:http://www.djangoproject.com/documentation/db-api/#related-objects. > > The short version, though, is this: > > Given a author ID, to find all the books by that author you'd use:: > > Book.objects.filter(authors__pk=author_id) > > Or, given a particular author object:: > > author.book_set.all() > > (Where did "book_set" come from? It's automatically created on the > "other side" of the many-to-many relation you created from Book to > Author. You can change the name of that relation attribute using the > "related_name" option to ManyToManyField). > > Jacob > > PS: Also see Chapter 5 of the Django Book > (http://djangobook.com/en/1.0/chapter05/);it's got examples pretty > similar to what you're doing. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
