docs: def get_fields(self, request, obj=None):
          """
          For subclasses of ``Orderable``, the ``_order`` field must
          always be present and be the last field.
          """
          fields = super(BaseDynamicInlineAdmin, self).get_fields(request, obj)
          if issubclass(self.model, Orderable):
              fields = list(fields)
              try:
                  fields.remove("_order")
              except ValueError:
                  pass
              fields.append("_order")
          return fields