fix: sorting of elements in search all

course_discovery/apps/course_metadata/search_indexes/serializers/aggregation.py

@@ -86,6 +86,12 @@ def to_representation(self, data):
         This will invoke the respective custom list serializers for all the documents.
         """
         iterable = data.all() if isinstance(data, models.Manager) else data
+        last_item = iterable[-1] if len(iterable) > 0 else None
+        self._context["last_item"] = last_item
+        view = self._context.get("view")
+        if view:
+            setattr(view, "last_item", last_item)
+
         grouped_instances = self.group_multi_serializer_instances(iterable)
 
         representations = []

course_discovery/apps/edx_elasticsearch_dsl_extensions/viewsets.py

@@ -127,8 +127,9 @@ def get_paginated_response(self, data):
         Get paginated response, including search_after value for the next page.
         """
         response = super().get_paginated_response(data)
-        last_item = data[-1] if data else None
-        search_after = last_item.get("sort") if last_item else None
+        view = self.request.parser_context.get("view")
+        last_item = getattr(view, "last_item", None)
+        search_after = last_item.meta.sort.copy() if last_item else None
         next_link = response.data.pop("next", None)
         response.data["next"] = search_after if next_link else None
         return response