def forwards(self, orm):

        # Changing field 'ThreadedComment.last_child'
        db.alter_column('threadedcomments_comment', 'last_child_id', self.gf('django.db.models.fields.related.ForeignKey')(to=orm['threadedcomments.ThreadedComment'], null=True, on_delete=models.SET_NULL))
        if south.__version__ <= "0.7.4" and not db.dry_run:
            print " * WARNING: Your South version is not able to add ON DELETE SET NULL. Please fix this manually."
dataset/ETHPy150Open HonzaKral/django-threadedcomments/threadedcomments/south_migrations/0002_set__last_child_id__on_delete__set_null.py/Migration.forwards/original