Should be doable but you need to filter on a field of the subclass being null.
SomeModel.objects.filter(somemodelsubclass__somefield=None) , somefield cannot be id or pk. On 27 Feb, 14:13, Calvin Spealman <[email protected]> wrote: > On Fri, Feb 27, 2009 at 1:31 AM, Malcolm Tredinnick > > > > <[email protected]> wrote: > > > On Thu, 2009-02-26 at 11:08 -0500, Calvin Spealman wrote: > >> I'm looking for the best way to query based on the existence of an > >> instance of a subclass. In my case, there are Actions that have > >> several subclasses, like FriendRequest, PhotosTagged, etc. The user > >> has selected a set of types they are interested in, so I need to query > >> for all the actions that are instances of one of these particular > >> subclasses. I could query for all, and then filter on the python-side, > >> but that is what I'm looking to avoid. Is there a way to do this from > >> the query api. If there isn't, what would one look like and would it > >> be accepted? > > > This is a "how do I....?" sort of question. The best place to ask those > > is the django-users mailing list. This list is for the internal > > development of Django itself. > > I ask here because I've already exhausted user forums and determined > the answer is "You can't do that", so now I'm looking for if changes > to allow such a query would be allowed, or very easy to add. > > -- > Read my blog! I depend on your acceptance of my opinion! I am > interesting!http://techblog.ironfroggy.com/ > Follow me if you're into that sort of thing:http://www.twitter.com/ironfroggy --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/django-developers?hl=en -~----------~----~----~----~------~----~------~--~---
