Change proxy models to inherit historical settings from their concret…

…e parent

simple_history/__init__.py

@@ -29,5 +29,5 @@ def register(
         records.manager_name = manager_name
         records.module = app and ("%s.models" % app) or model.__module__
         records.add_extra_methods(model)
-        history_name = utils.natural_key_from_model(records.finalize(model))[1]
-        models.registered_models[natural_key] = history_name
+        records.concrete_natural_key = utils.natural_key_from_model(model._meta.concrete_model or model)
+        records.finalize(model)

simple_history/models.py

@@ -11,6 +11,7 @@
 from django.db.models.fields.proxy import OrderWrt
 from django.db.models.fields.related import RelatedField
 from django.db.models.related import RelatedObject
+from django.db.models.loading import get_model
 from django.conf import settings
 from django.contrib import admin
 from django.utils import importlib, six
@@ -48,7 +49,8 @@ def __init__(self, verbose_name=None, bases=(models.Model,),
     def contribute_to_class(self, cls, name):
         self.manager_name = name
         self.module = cls.__module__
-        models.signals.class_prepared.connect(self.finalize, sender=cls)
+        self.concrete_natural_key = utils.natural_key_from_model(cls._meta.concrete_model or cls)
+        models.signals.class_prepared.connect(self.finalize)
         self.add_extra_methods(cls)
 
     def add_extra_methods(self, cls):
@@ -68,7 +70,16 @@ def save_without_historical_record(self, *args, **kwargs):
                 save_without_historical_record)
 
     def finalize(self, sender, **kwargs):
-        history_model = self.create_history_model(sender)
+        if self.concrete_natural_key != utils.natural_key_from_model(sender._meta.concrete_model):
+            return
+        history_model_name = registered_models.get(self.concrete_natural_key)
+        if not history_model_name:
+            history_model = self.create_history_model(sender)
+        else:
+            try:
+                history_model = getattr(sender._meta.concrete_model, self.manager_name).model
+            except AttributeError:  # possible during migrations
+                return
         module = importlib.import_module(self.module)
         setattr(module, history_model.__name__, history_model)