Calculate parts on order for a Part / SupplierPart

InvenTree/InvenTree/status_codes.py

@@ -32,6 +32,19 @@ class OrderStatus(StatusCode):
         RETURNED: _("Returned"),
     }
 
+    # Open orders
+    OPEN = [
+        PENDING,
+        PLACED,
+    ]
+
+    # Failed orders
+    FAILED = [
+        CANCELLED,
+        LOST,
+        RETURNED
+    ]    
+
 
 class StockStatus(StatusCode):
 

InvenTree/company/models.py

@@ -10,9 +10,10 @@ import os
 import math
 
 from django.core.validators import MinValueValidator
+from django.db import models
+from django.db.models import Sum
 
 from django.apps import apps
-from django.db import models
 from django.urls import reverse
 from django.conf import settings
 from django.contrib.staticfiles.templatetags.staticfiles import static
@@ -132,10 +133,7 @@ class Company(models.Model):
 
     def outstanding_purchase_orders(self):
         """ Return purchase orders which are 'outstanding' """
-        return self.purchase_orders.filter(status__in=[
+        return self.purchase_orders.filter(status__in=OrderStatus.OPEN)
-            OrderStatus.PENDING,
-            OrderStatus.PLACED
-        ])
 
     def complete_purchase_orders(self):
         return self.purchase_orders.filter(status=OrderStatus.COMPLETE)
@@ -143,12 +141,7 @@ class Company(models.Model):
     def failed_purchase_orders(self):
         """ Return any purchase orders which were not successful """
 
-        return self.purchase_orders.filter(status__in=[
+        return self.purchase_orders.filter(status__in=OrderStatus.FAILED)
-            OrderStatus.CANCELLED,
-            OrderStatus.LOST,
-            OrderStatus.RETURNED
-        ])
-
 
 class Contact(models.Model):
     """ A Contact represents a person who works at a particular company.
@@ -307,6 +300,24 @@ class SupplierPart(models.Model):
         else:
             return None
 
+    def open_orders(self):
+        """ Return a database query for PO line items for this SupplierPart, 
+        limited to purchase orders that are open / outstanding.
+        """
+
+        return self.purchase_order_line_items.prefetch_related('order').filter(order__status__in=OrderStatus.OPEN)
+
+    def on_order(self):
+        """ Return the total quantity of items currently on order. 
+
+        Subtract partially received stock as appropriate
+        """
+
+        totals = self.open_orders().aggregate(Sum('quantity'), Sum('received'))
+
+        return totals['quantity__sum'] - totals['received__sum']
+    
+
     def purchase_orders(self):
         """ Returns a list of purchase orders relating to this supplier part """
 

InvenTree/part/models.py

@@ -806,6 +806,11 @@ class Part(models.Model):
 
         return orders
 
+    def on_order(self):
+        """ Return the total number of items on order for this part. """
+
+        return sum([part.on_order() for part in self.supplier_parts.all()])
+
 
 def attach_file(instance, filename):
     """ Function for storing a file for a PartAttachment

InvenTree/part/templates/part/part_base.html

@@ -96,6 +96,12 @@
             <td>{{ part.allocation_count }}</td>
         </tr>
         {% endif %}
+        {% if part.on_order > 0 %}
+        <tr>
+            <td>On Order</td>
+            <td>{{ part.on_order }}</td>
+        </tr>
+        {% endif %}
     </table>
 </div>
 </div>