Allow mutating the queryset

mixins/views.py

@@ -50,6 +50,9 @@ class ObjectList(RestrictedViewMixin, ObjectNameMixin, ListView):
     delete_all_url_name = None
     widget_options = None
 
+    def queryset_mutate(self, queryset):
+        pass
+
     # copied from BaseListView
     def get(self, request, *args, **kwargs):
         type = kwargs.get("type", None)
@@ -60,6 +63,7 @@ class ObjectList(RestrictedViewMixin, ObjectNameMixin, ListView):
 
         self.request = request
         self.object_list = self.get_queryset(**kwargs)
+        self.queryset_mutate(self.queryset)
         if isinstance(self.object_list, HttpResponse):
             return self.object_list
         if isinstance(self.object_list, HttpResponseBadRequest):