fix Swagger UI generation failing on CordDebugViewSet
diff --git a/xos/core/xoslib/methods/cordsubscriber.py b/xos/core/xoslib/methods/cordsubscriber.py
index ea8da80..99cc29a 100644
--- a/xos/core/xoslib/methods/cordsubscriber.py
+++ b/xos/core/xoslib/methods/cordsubscriber.py
@@ -392,10 +392,16 @@
 
         return Response( {"vbng_mapping": mappings} )
 
+class CordDebugIdSerializer(serializers.ModelSerializer, PlusSerializerMixin):
+    id = ReadOnlyField()
+    class Meta:
+        model = CordSubscriber
+
 class CordDebugViewSet(XOSViewSet):
     base_name = "cord_debug"
     method_name = "rs/cord_debug"
     method_kind = "viewset"
+    serializer_class = CordDebugIdSerializer
 
     @classmethod
     def get_urlpatterns(self):