Tweak "auto_allocate" serial numbers (#9942)

- Allow "in production" items
- Enables allocation of child builds

src/backend/InvenTree/build/models.py

@@ -938,14 +938,24 @@ class Build(
                     for bom_item in trackable_parts:
                         valid_part_ids = valid_parts.get(bom_item.pk, [])
 
-                        items = stock.models.StockItem.objects.filter(
+                        # Find all matching stock items, based on serial number
-                            part__pk__in=valid_part_ids,
+                        stock_items = list(
-                            serial=output.serial,
+                            stock.models.StockItem.objects.filter(
-                            quantity=1,
+                                part__pk__in=valid_part_ids,
-                        ).filter(stock.models.StockItem.IN_STOCK_FILTER)
+                                serial=output.serial,
+                                quantity=1,
+                            )
+                        )
 
-                        if items.exists() and items.count() == 1:
+                        # Filter stock items to only those which are in stock
-                            stock_item = items[0]
+                        # Note that we can accept "in production" items here
+                        available_items = filter(
+                            lambda item: item.is_in_stock(check_in_production=False),
+                            stock_items,
+                        )
+
+                        if len(available_items) == 1:
+                            stock_item = available_items[0]
 
                             # Find the 'BuildLine' object which points to this BomItem
                             try:

src/backend/InvenTree/stock/models.py

@@ -1592,13 +1592,17 @@ class StockItem(
         return self.children.count()
 
     def is_in_stock(
-        self, check_status: bool = True, check_quantity: bool = True
+        self,
+        check_status: bool = True,
+        check_quantity: bool = True,
+        check_in_production: bool = True,
     ) -> bool:
         """Return True if this StockItem is "in stock".
 
-        Args:
+        Arguments:
             check_status: If True, check the status of the StockItem. Defaults to True.
             check_quantity: If True, check the quantity of the StockItem. Defaults to True.
+            check_in_production: If True, check if the item is in production. Defaults to True.
         """
         if check_status and self.status not in StockStatusGroups.AVAILABLE_CODES:
             return False
@@ -1606,6 +1610,9 @@ class StockItem(
         if check_quantity and self.quantity <= 0:
             return False
 
+        if check_in_production and self.is_building:
+            return False
+
         return all([
             self.sales_order is None,  # Not assigned to a SalesOrder
             self.belongs_to is None,  # Not installed inside another StockItem