Refs #26144 -- Used proxy_for_model instead of mro inspection.

import inspect

import warnings

from collections import OrderedDict

            for model in models:

                if model in excluded_models:

                    continue

                if model._meta.proxy and inspect.getmro(model)[1] not in models:

                if model._meta.proxy and model._meta.proxy_for_model not in models:

                    warnings.warn(

                        "%s is a proxy model and won't be serialized." % model._meta.label,

                        category=ProxyModelWarning,