On Sun, Feb 15, 2009 at 8:38 PM, Trey <jameslon...@gmail.com> wrote: > > Thanks Malcom, > > I suspected this to be the answer, however since I just finished > refactoring all of my field references to stop referencing the child > model explicitly to give inheritance a try, I was hoping that wouldn't > be the case :) > > There is one thing about OneToOne fields that isn't exactly equivalent > to inheritance, and correct me if I am wrong, you can't ask > select_related to go backwards in a relationship. This is critical for > my application. > > > > On Feb 15, 7:52 pm, Malcolm Tredinnick <malc...@pointy-stick.com> > wrote: > > On Sun, 2009-02-15 at 16:39 -0800, Trey wrote: > > > I thought I would ask the question here first before going to devs > > > with it. Is it possible to update a model without updating that models > > > parent table? > > > > No. Django doesn't do anything like "damage tracking" to determine which > > fields have changed. One day that might well be implemented (there are a > > number of different possible approaches, each with benefits and > > drawbacks), but until then, no. > > > > The solution in your case is not to use Python-level inheritance. > > Remember that it's only an alternative modelling of an explicit > > one-to-one relation. So use an explicit relation and no "chained saving" > > will take place (the trade-off being that if you modify the related > > model, you'll be responsible for explicitly saving it). > > > > Regards, > > Malcolm > > > select_related doesn't traverse the reverse relation from inheritance either, there's a ticket about this: http://code.djangoproject.com/ticket/7270 in any event, how can your application depend on that, select_related is an optimization, not a behavior changer.
Alex -- "I disapprove of what you say, but I will defend to the death your right to say it." --Voltaire "The people's good is the highest law."--Cicero --~--~---------~--~----~------------~-------~--~----~ 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 django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
