On Mon, 2007-05-21 at 22:20 -0700, John M wrote: > Is it possible to order a queryset by a custom field? > > I have several programmatic generated fields and need to sort the > display by them, is this possible?
The order_by fields are passed to the database and used in the SQL statement, so you cannot use arbitrary fields there. You are restricted to database columns (you can't even use computed values from those columns). I suspect a workaround is possible, though. All completely untested, but it doesn't look that hard... Create a subclass of QuerySet that overrides the __iter__ method. In your version of __iter__, you call self._get_data(), sort the results however you want and then return an iterator over the resulting sequence. To use this subclass in your models, create a custom manager on your class that overrides the get_query_set() method of a normal manager. Your custom method returns your QuerySet subclass, instead of the QuerySet returned by the default get_query_set(). You can see the details of the default manager that you are going to override in django.db.models.manager and QuerySet.__iter__ is in django.db.models.query. Details of creating a custom manager method are in http://www.djangoproject.com/documentation/model-api/#custom-managers Regards, Malcolm --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
