I'm not a South expert, but I'd assume you'd do this via south data migrations (http://south.readthedocs.org/en/latest/tutorial/part3.html#data-migrations) .
You'd create: - One (auto) migration script to create the Base table and new columns in Foo and Bar - A data migration script to migrate the current data set from Foo and Bar into Base and fill in the OneToOneField keys accordingly - A final (auto) migration script to remove the transferred fields from Foo and Bar -----Original Message----- From: django-users@googlegroups.com [mailto:django-users@googlegroups.com] On Behalf Of Lachlan Musicman Sent: Wednesday, July 04, 2012 1:18 PM To: django-users@googlegroups.com Subject: Re: migration via south for inheritance change -> please help I'd like to know this too - but I think the real answer is "get better at python" - you are essentially (from what I can tell) in a django shell when south pops the "not blank, not null but no data" error - try pulling in some details from fixtures? cheers L. On Thu, Jul 5, 2012 at 2:30 AM, Daniel Walz <mcj...@gmail.com> wrote: > ...no one? > > regards, mcJack > > 2012/7/2 mcJack <mcj...@gmail.com>: >> Hi all, >> >> I've got a problem migrating some changes in the model, so I tried to >> solve it with south. >> The situation: >> I implemented two classes, which share some functionality. Now that I >> improved a little with python, django and co. I wanted to use >> inheritance for that issue. >> The model looks like this: >> >> class Foo(models.Model): >> eggs = models.TextField( null=True, blank=True ) >> plants = models.TextField( null=True, blank=True ) >> carpet = models.IntegerField() >> >> class Bar(models.Model): >> eggs = models.TextField( null=True, blank=True ) >> plants = models.TextField( null=True, blank=True ) >> car = models.IntegerField() >> >> >> And obviously I want to transform to: >> class Base(models.Model): >> eggs = models.TextField( null=True, blank=True ) >> plants = models.TextField( null=True, blank=True ) >> >> class Foo(models.Model): >> base = models.OneToOneField( 'Base', parent_link=True ) >> carpet = models.IntegerField() >> >> class Bar(models.Model): >> base = models.OneToOneField( 'Base', parent_link=True ) >> car = models.IntegerField() >> >> But how can I tell south to fill the super class with the data from >> the old schema? >> >> Can I add this information manually in the created migration script? >> or is there an option/switch I didn't notice? >> >> Any hints are very welcome, thanks a lot >> >> mcJack >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Django users" group. >> To view this discussion on the web visit >> https://groups.google.com/d/msg/django-users/-/_6CYJ1yqh-sJ. >> 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. > > > > -- > Daniel Walz - mcj...@gmail.com > Bremen, Germany > > -- > 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. > -- 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. -- 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.
