🔍 Problem

In admin inlines, Django instantiates model instances with default field values — this means that the order_with_respect_to field is initially None, and only later gets set during the form processing or saving.

However, OrderedModel.__init__() captures the _original_wrt_map() at instantiation time, so when the field is later set to a proper object, wrt_changed becomes True, triggering while saving:

• Decreasing order in the old (empty) context
• Reordering in the new one
• In some admin workflows, this manifests as a delete-and-recreate cycle

This happens even though the object is new and never had a valid wrt value before.

Workaround:

    def get_formset(self, request, obj=None, **kwargs):
        formset_class = super().get_formset(request, obj, **kwargs)

        class PatchedFormset(formset_class):
            def _construct_form(self, i, **kwargs):
                form = super()._construct_form(i, **kwargs)
                if self.instance:
                    form.instance.*order_with_respect_to* = self.instance
                    if hasattr(form.instance, '_original_wrt_map'):
                        form.instance._original_wrt_map = form.instance._wrt_map()
                return form

        return PatchedFormset