South

copy one field to another

• django-admin.py datamigration app migration_name

• edit migration

def forwards(self, orm):
    "Write your forwards methods here."
    for mod in Model.objects.all():
        mod.field_new = mod_field_old
        med.save()


def backwards(self, orm):
    "Write your backwards methods here."
    raise RuntimeError("Cannot reverse this migration.")