On Mar 4, 8:57 pm, Malcolm Tredinnick <malc...@pointy-stick.com> wrote: > On Wed, 2009-03-04 at 10:43 -0800, arbi wrote: > > Hello, > > I am new to Django and programming... > > I have a model similar to this one : > > > class myModel : > > attribute 1 = models.ForeignKey(myModel2, primary_key = True) > > attribute 2 = models.ForeignKey(myModel3, primary_key = True) > > > is it possible to have two primary keys? > > No. One primary key per model. > > > In fact I want that the id of an instance of this class is the > > concatenation of the (attribute 1 +attribute2). > > How to do this? > > You might be able to do it with a custom field type and fair bit of > code. However, this is definitely not the approach to take if you are > just starting out. > > Instead, just let the primary key be the default one Django provides you > with. You can have another property or method on the model that creates > your combined value that you can use for other purposes. Trying to > overly control the primary key almost always is not necessary. > > What is the problem you are really trying to solve here? > > Regards, > Malcolm
I think that all you require is that you use the standard, automatic primary key, and ensure that the two fields are indexed and unique together. http://docs.djangoproject.com/en/dev/ref/models/options/#unique-together Wayne --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
