Swap model for serializer from proxy model

netbox/utilities/api.py

@@ -27,6 +27,13 @@ def get_serializer_for_model(model, prefix=''):
     # Serializers for Django's auth models are in the users app
     if app_name == 'auth':
         app_name = 'users'
+    # Account for changes using Proxy model
+    if app_name == 'users':
+        if model_name == 'NetBoxUser':
+            model_name = 'User'
+        elif model_name == 'NetBoxGroup':
+            model_name = 'Group'
+
     serializer_name = f'{app_name}.api.serializers.{prefix}{model_name}Serializer'
     try:
         return dynamic_import(serializer_name)