Reducing request time for PartList API

- Initial query time = 5.91s
- Prefetch related part categories = 3.64s

InvenTree/part/api.py

@@ -110,6 +110,9 @@ class PartList(generics.ListCreateAPIView):
             except PartCategory.DoesNotExist:
                 pass
 
+        # Ensure that related models are pre-loaded to reduce DB trips
+        parts_list = self.get_serializer_class().setup_eager_loading(parts_list)
+
         return parts_list
 
     permission_classes = [

InvenTree/part/serializers.py

@@ -58,6 +58,11 @@ class PartSerializer(serializers.ModelSerializer):
     image_url = serializers.CharField(source='get_image_url', read_only=True)
     category_name = serializers.CharField(source='category_path', read_only=True)
 
+    @staticmethod
+    def setup_eager_loading(queryset):
+        queryset = queryset.prefetch_related('category')
+        return queryset
+
     class Meta:
         model = Part
         partial = True