Add "overdue" flag to serializer

- Also allow filtering by overdue status in the API

InvenTree/order/api.py

@@ -80,6 +80,17 @@ class POList(generics.ListCreateAPIView):
             else:
                 queryset = queryset.exclude(status__in=PurchaseOrderStatus.OPEN)
 
+        # Filter by 'overdue' status
+        overdue = params.get('overdue', None)
+
+        if overdue is not None:
+            overdue = str2bool(overdue)
+
+            if overdue:
+                queryset = queryset.filter(PurchaseOrder.OVERDUE_FILTER)
+            else:
+                queryset = queryset.exclude(PurchaseOrder.OVERDUE_FILTER)
+
         # Special filtering for 'status' field
         status = params.get('status', None)
 

InvenTree/order/serializers.py

@@ -40,12 +40,24 @@ class POSerializer(InvenTreeModelSerializer):
     def annotate_queryset(queryset):
         """
         Add extra information to the queryset
+
+        - Number of liens in the PurchaseOrder
+        - Overdue status of the PurchaseOrder
         """
 
         queryset = queryset.annotate(
             line_items=SubqueryCount('lines')
         )
 
+        queryset = queryset.annotate(
+            overdue=Case(
+                When(
+                    PurchaseOrder.OVERDUE_FILTER, then=Value(True, output_field=BooleanField()),
+                ),
+                default=Value(False, output_field=BooleanField())
+            )
+        )
+
         return queryset
 
     supplier_detail = CompanyBriefSerializer(source='supplier', many=False, read_only=True)
@@ -54,6 +66,8 @@ class POSerializer(InvenTreeModelSerializer):
 
     status_text = serializers.CharField(source='get_status_display', read_only=True)
 
+    overdue = serializers.BooleanField(required=False, read_only=True)
+
     class Meta:
         model = PurchaseOrder
         
@@ -65,6 +79,7 @@ class POSerializer(InvenTreeModelSerializer):
             'description',
             'line_items',
             'link',
+            'overdue',
             'reference',
             'supplier',
             'supplier_detail',