Stock history fix (#4541)

* Fix bug in allocateToCustomer method

* Data migration to alter stock tracking history with new codes and data

* Prevent note duplication

InvenTree/stock/migrations/0096_auto_20230330_1121.py

@@ -0,0 +1,70 @@
+# Generated by Django 3.2.18 on 2023-03-30 11:21
+
+from django.db import migrations
+
+
+def update_stock_history(apps, schema_editor):
+    """Data migration to fix a 'shortcoming' in the implementation of StockTracking history
+
+    Prior to https://github.com/inventree/InvenTree/pull/4488,
+    shipping items via a SalesOrder did not record the SalesOrder in the tracking history.
+    This PR looks to add in SalesOrder history where it does not already exist:
+
+    - Look for StockItems which are currently assigned to a SalesOrder
+    - Check that it does *not* have any appropriate history
+    - Add the appropriate history!
+    """
+
+    from InvenTree.status_codes import StockHistoryCode
+
+    StockItem = apps.get_model('stock', 'stockitem')
+    StockItemTracking = apps.get_model('stock', 'stockitemtracking')
+
+    # Find StockItems which are marked as against a SalesOrder
+    items = StockItem.objects.exclude(sales_order=None)
+
+    n = 0
+
+    for item in items:
+        # Find newest relevent history
+        history = StockItemTracking.objects.filter(
+            item=item,
+            tracking_type__in=[StockHistoryCode.SENT_TO_CUSTOMER, StockHistoryCode.SHIPPED_AGAINST_SALES_ORDER]
+        ).order_by('-date').first()
+
+        if not history:
+            continue
+
+        # We've already updated this one, it appears
+        if history.tracking_type != StockHistoryCode.SENT_TO_CUSTOMER:
+            continue
+
+        # Update the 'deltas' of this history to include SalesOrder information
+        history.deltas['salesorder'] = item.sales_order.pk
+
+        # Change the history type
+        history.tracking_type = StockHistoryCode.SHIPPED_AGAINST_SALES_ORDER
+
+        history.save()
+        n += 1
+
+    if n > 0:
+        print(f"Updated {n} StockItemTracking entries with SalesOrder data")
+
+
+def nope(apps, schema_editor):
+    """Provided for reverse migration compatibility"""
+    pass
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stock', '0095_stocklocation_external'),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            update_stock_history, reverse_code=nope,
+        )
+    ]