docs: def post_save(sender, instance, created, **kwargs):
      """
      After save create order instance for sending instance for orderable models.
      """
      # Only create order model instances for
      # those modules specified in settings.
      model_label = '.'.join([sender._meta.app_label, sender._meta.object_name])
      labels = resolve_labels(model_label)
  
      order_field_names = is_orderable(model_label)
      if order_field_names:
          orderitem_set = getattr(
              instance,
              resolve_order_item_related_set_name(labels)
          )
          if not orderitem_set.all():
              fields = {}
              for order_field_name in order_field_names:
                  fields[order_field_name] = 1
              orderitem_set.model.objects.create(item=instance, **fields)
              sanitize_order(orderitem_set.model)