TMSS-1124: fetch the subtask's input/output dataproducts and all related...

TMSS-1124: fetch the subtask's input/output dataproducts and all related properties in one queryset. Major speedup

SAS/TMSS/backend/src/tmss/tmssapp/viewsets/scheduling.py

@@ -311,7 +311,9 @@ class SubtaskViewSet(LOFARViewSet):
     @action(methods=['get'], detail=True, url_name='input_dataproducts')
     def input_dataproducts(self, request, pk=None):
         subtask = get_object_or_404(models.Subtask, pk=pk)
-        serializer = serializers.DataproductSerializer(subtask.input_dataproducts, many=True, context={'request': request})
+        # fetch the subtask's input_dataproducts and all related properties in one queryset. Major speedup.
+        input_dataproducts = subtask.input_dataproducts.select_related('dataformat', 'datatype', 'specifications_template', 'producer', 'feedback_template', 'sap', 'global_identifier', 'archive_info').prefetch_related('consumers')
+        serializer = serializers.DataproductSerializer(input_dataproducts, many=True, context={'request': request})
         return RestResponse(serializer.data)
 
 
@@ -321,7 +323,9 @@ class SubtaskViewSet(LOFARViewSet):
     @action(methods=['get'], detail=True, url_name='output_dataproducts')
     def output_dataproducts(self, request, pk=None):
         subtask = get_object_or_404(models.Subtask, pk=pk)
-        serializer = serializers.DataproductSerializer(subtask.output_dataproducts, many=True, context={'request': request})
+        # fetch the subtask's output_dataproducts and all related properties in one queryset. Major speedup.
+        output_dataproducts = subtask.output_dataproducts.select_related('dataformat', 'datatype', 'specifications_template', 'producer', 'feedback_template', 'sap', 'global_identifier', 'archive_info').prefetch_related('consumers')
+        serializer = serializers.DataproductSerializer(output_dataproducts, many=True, context={'request': request})
         return RestResponse(serializer.data)