From 9d5b938ceda62fef34181855f7167f966b00b285 Mon Sep 17 00:00:00 2001
From: Oliver Walters <oliver.henry.walters@gmail.com>
Date: Tue, 21 May 2019 07:57:44 +1000
Subject: [PATCH 1/2] Don't serialize 'available_stock' in PartSerializer

---
 InvenTree/part/models.py      | 11 ++++++++---
 InvenTree/part/serializers.py |  2 +-
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/InvenTree/part/models.py b/InvenTree/part/models.py
index 04277508c7..af23b7484b 100644
--- a/InvenTree/part/models.py
+++ b/InvenTree/part/models.py
@@ -17,6 +17,7 @@ from django.conf import settings
 from django.core.files.base import ContentFile
 from django.db import models, transaction
 from django.db.models import Sum
+from django.db.models import prefetch_related_objects
 from django.core.validators import MinValueValidator
 
 from django.contrib.staticfiles.templatetags.staticfiles import static
@@ -411,7 +412,7 @@ class Part(models.Model):
         total = None
 
         # Calculate the minimum number of parts that can be built using each sub-part
-        for item in self.bom_items.all().select_related('sub_part'):
+        for item in self.bom_items.all().prefetch_related('sub_part__stock_items'):
             stock = item.sub_part.available_stock
             n = int(1.0 * stock / item.quantity)
 
@@ -449,9 +450,11 @@ class Part(models.Model):
 
         builds = []
 
-        for item in self.used_in.all().prefetch_related('part'):
+        for item in self.used_in.all().prefetch_related('part__builds'):
 
-            for build in item.part.active_builds:
+            active = item.part.active_builds
+            
+            for build in active:
                 b = {}
 
                 b['build'] = build
@@ -459,6 +462,8 @@ class Part(models.Model):
 
                 builds.append(b)
 
+        prefetch_related_objects(builds, 'build_items')
+
         return builds
 
     @property
diff --git a/InvenTree/part/serializers.py b/InvenTree/part/serializers.py
index ddbbab9e57..213cb9c75e 100644
--- a/InvenTree/part/serializers.py
+++ b/InvenTree/part/serializers.py
@@ -89,7 +89,7 @@ class PartSerializer(serializers.ModelSerializer):
             'keywords',
             'URL',
             'total_stock',
-            'available_stock',
+            # 'available_stock',
             'units',
             'trackable',
             'buildable',

From f19d4eec79b69dba6b23e9fe8088d5052ad4006c Mon Sep 17 00:00:00 2001
From: Oliver Walters <oliver.henry.walters@gmail.com>
Date: Tue, 21 May 2019 08:19:16 +1000
Subject: [PATCH 2/2] Improve query speed for supplierpart api

---
 InvenTree/company/api.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/InvenTree/company/api.py b/InvenTree/company/api.py
index 894974d3e9..f7bf9acc3f 100644
--- a/InvenTree/company/api.py
+++ b/InvenTree/company/api.py
@@ -75,7 +75,14 @@ class SupplierPartList(generics.ListCreateAPIView):
     - POST: Create a new SupplierPart object
     """
 
-    queryset = SupplierPart.objects.all()
+    queryset = SupplierPart.objects.all().prefetch_related(
+        'part',
+        'part__category',
+        'part__stock_items',
+        'part__bom_items',
+        'part__builds',
+        'supplier')
+
     serializer_class = SupplierPartSerializer
 
     permission_classes = [