override using argument

simple_history/models.py

@@ -78,6 +78,7 @@ def __init__(
         history_user_id_field=None,
         history_user_getter=_history_user_getter,
         history_user_setter=_history_user_setter,
+        using=None,
     ):
         self.user_set_verbose_name = verbose_name
         self.user_related_name = user_related_name
@@ -93,6 +94,7 @@ def __init__(
         self.user_id_field = history_user_id_field
         self.user_getter = history_user_getter
         self.user_setter = history_user_setter
+        self.using = using
 
         if excluded_fields is None:
             excluded_fields = []
@@ -413,14 +415,14 @@ def post_save(self, instance, created, using=None, **kwargs):
         if not created and hasattr(instance, "skip_history_when_saving"):
             return
         if not kwargs.get("raw", False):
-            self.create_historical_record(instance, created and "+" or "~", using=(instance.history.db or using))
+            self.create_historical_record(instance, created and "+" or "~", using=(self.using or using))
 
     def post_delete(self, instance, using=None, **kwargs):
         if self.cascade_delete_history:
             manager = getattr(instance, self.manager_name)
             manager.using(using).all().delete()
         else:
-            self.create_historical_record(instance, "-", using=(instance.history.db or using))
+            self.create_historical_record(instance, "-", using=(self.using or using))
 
     def create_historical_record(self, instance, history_type, using=None):
         history_date = getattr(instance, "_history_date", now())