phretor

    def forwards(self, orm):
        "Write your forwards methods here."
        def set_real_type(obj):
            obj.real_type = orm["contenttypes.ContentType"].objects.get_for_model(type(obj))
            obj.save()

        # migrate existing objects
        for obj in orm.Book.objects.all():
            set_real_type(obj)
        

phretor

from django.db import models
from django.utils.translation import ugettext_lazy as _
from django.core.validators import RegexValidator
from django.template.defaultfilters import slugify
from django_countries.fields import CountryField

from model_utils import Choices
from filebrowser.fields import FileBrowseField
try:
    from south.modelsinspector import add_introspection_rules

phretor

class Migration(SchemaMigration):

    def forwards(self, orm):
        
        # Adding field 'Publication.subclass'
        db.add_column('publishing_publication', 'subclass', self.gf('django.db.models.fields.CharField')(default='Publication', max_length=48), keep_default=False)
        for obj in orm.Publication.objects.all():
            obj.subclass = '{0}.{1}'.format(
                obj._meta.app_label, obj.__class__.__name__)
            obj.save()