From 108382cc8915fb2ffafaa22366bab4c9a74f4c33 Mon Sep 17 00:00:00 2001
From: Oliver Walters <oliver.henry.walters@gmail.com>
Date: Mon, 9 Sep 2019 08:17:26 +1000
Subject: [PATCH] Prefecth related data for stock export

- Example export reduced from 1,024 queries to 7
---
 InvenTree/stock/views.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/InvenTree/stock/views.py b/InvenTree/stock/views.py
index 29b5c5d6bb..26a957a644 100644
--- a/InvenTree/stock/views.py
+++ b/InvenTree/stock/views.py
@@ -223,6 +223,9 @@ class StockExport(AjaxView):
         stock_items = stock_items.filter(customer=None)
         stock_items = stock_items.filter(belongs_to=None)
 
+        # Pre-fetch related fields to reduce DB queries
+        stock_items = stock_items.prefetch_related('part', 'supplier_part__supplier', 'location', 'purchase_order', 'build')
+
         # Column headers
         headers = [
             _('Stock ID'),