Reduce BOM listing time to ~1.8s

InvenTree/part/api.py

@@ -204,9 +204,13 @@ class BomList(generics.ListCreateAPIView):
     - POST: Create a new BomItem object
     """
     
-    queryset = BomItem.objects.all()
     serializer_class = BomItemSerializer
 
+    def get_queryset(self):
+        queryset = BomItem.objects.all()
+        queryset = self.get_serializer_class().setup_eager_loading(queryset)
+        return queryset
+
     permission_classes = [
         permissions.IsAuthenticatedOrReadOnly,
     ]

InvenTree/part/serializers.py

@@ -112,16 +112,20 @@ class PartStarSerializer(InvenTreeModelSerializer):
 class BomItemSerializer(InvenTreeModelSerializer):
     """ Serializer for BomItem object """
 
-    part_detail = PartBriefSerializer(source='part', many=False, read_only=True)
     sub_part_detail = PartBriefSerializer(source='sub_part', many=False, read_only=True)
     price_info = serializers.CharField(read_only=True)
 
+    @staticmethod
+    def setup_eager_loading(queryset):
+        queryset = queryset.prefetch_related('sub_part')
+        queryset = queryset.prefetch_related('sub_part__category')
+        return queryset
+
     class Meta:
         model = BomItem
         fields = [
             'pk',
             'part',
-            'part_detail',
             'sub_part',
             'sub_part_detail',
             'quantity',