New approach for multiple annotations

- Use the django-sql-utils addon - https://github.com/martsberger/django-sql-utils
- The "distinct=True" flag was not doing what I thought it was doing...

InvenTree/part/api.py

@@ -377,6 +377,7 @@ class PartList(generics.ListCreateAPIView):
     def get_queryset(self, *args, **kwargs):
 
         queryset = super().get_queryset(*args, **kwargs)
+        
         queryset = part_serializers.PartSerializer.prefetch_queryset(queryset)
         queryset = part_serializers.PartSerializer.annotate_queryset(queryset)
 

InvenTree/part/serializers.py

@@ -15,7 +15,9 @@ from .models import PartTestTemplate
 
 from decimal import Decimal
 
-from django.db.models import Q, Sum
+from sql_util.utils import SubquerySum
+
+from django.db.models import Q
 from django.db.models.functions import Coalesce
 
 from InvenTree.status_codes import StockStatus, PurchaseOrderStatus, BuildStatus
@@ -190,28 +192,48 @@ class PartSerializer(InvenTreeModelSerializer):
         """
 
         # Filter to limit stock items to "available"
-        stock_filter = Q(stock_items__status__in=StockStatus.AVAILABLE_CODES)
+        stock_filter = Q(
+            status__in=StockStatus.AVAILABLE_CODES,
+            sales_order=None,
+            build_order=None,
+            belongs_to=None,
+            customer=None,
+        )
 
-        # Filter to limit orders to "open"
-        order_filter = Q(supplier_parts__purchase_order_line_items__order__status__in=PurchaseOrderStatus.OPEN)
+        # Annotate with the total 'in stock' quantity
+        queryset = queryset.annotate(
+            in_stock=Coalesce(
+                SubquerySum('stock_items__quantity', filter=stock_filter),
+                Decimal(0)
+            ),
+        )
 
         # Filter to limit builds to "active"
-        build_filter = Q(builds__status__in=BuildStatus.ACTIVE_CODES)
+        build_filter = Q(
+            status__in=BuildStatus.ACTIVE_CODES
+        )
 
-        # Annotate the number total stock count
+        # Annotate with the total 'building' quantity
         queryset = queryset.annotate(
-            in_stock=Coalesce(Sum('stock_items__quantity', filter=stock_filter, distinct=True), Decimal(0)),
-            ordering=Coalesce(Sum(
-                'supplier_parts__purchase_order_line_items__quantity',
-                filter=order_filter,
-                distinct=True
-            ), Decimal(0)) - Coalesce(Sum(
-                'supplier_parts__purchase_order_line_items__received',
-                filter=order_filter,
-                distinct=True
-            ), Decimal(0)),
             building=Coalesce(
-                Sum('builds__quantity', filter=build_filter, distinct=True), Decimal(0)
+                SubquerySum('builds__quantity', filter=build_filter),
+                Decimal(0),
+            )
+        )
+        
+        # Filter to limit orders to "open"
+        order_filter = Q(
+            order__status__in=PurchaseOrderStatus.OPEN
+        )
+
+        # Annotate with the total 'on order' quantity
+        queryset = queryset.annotate(
+            ordering=Coalesce(
+                SubquerySum('supplier_parts__purchase_order_line_items__quantity', filter=order_filter),
+                Decimal(0),
+            ) - Coalesce(
+                SubquerySum('supplier_parts__purchase_order_line_items__received', filter=order_filter),
+                Decimal(0),
             )
         )
         

InvenTree/templates/js/part.html

@@ -122,6 +122,9 @@ function loadPartVariantTable(table, partId, options) {
         {
             field: 'in_stock',
             title: '{% trans "Stock" %}',
+            formatter: function(value, row) {
+                return renderLink(value, `/part/${row.pk}/stock/`);
+            }
         }
     ];
 

requirements.txt

@@ -7,6 +7,7 @@ django-dbbackup==3.3.0          # Database backup / restore functionality
 django-cors-headers==3.2.0      # CORS headers extension for DRF
 django_filter==2.2.0            # Extended filtering options
 django-mptt==0.11.0             # Modified Preorder Tree Traversal
+django-sql-utils==0.5.0         # Advanced query annotation / aggregation
 django-markdownx==3.0.1         # Markdown form fields
 django-markdownify==0.8.0       # Markdown rendering
 coreapi==2.3.0                  # API documentation