Add background function to rebuild supplier parts when a part is saved

- Required to ensure that the "pack_size_native" is up to date

InvenTree/part/models.py

@@ -2294,6 +2294,13 @@ def after_save_part(sender, instance: Part, created, **kwargs):
             # Can sometimes occur if the referenced Part has issues
             pass
 
+        # Schedule a background task to rebuild any supplier parts
+        InvenTree.tasks.offload_task(
+            part_tasks.rebuild_supplier_parts,
+            instance.pk,
+            force_async=True
+        )
+
 
 class PartPricing(common.models.MetaMixin):
     """Model for caching min/max pricing information for a particular Part
@@ -3362,8 +3369,8 @@ def post_save_part_parameter_template(sender, instance, created, **kwargs):
 
     if InvenTree.ready.canAppAccessDatabase() and not InvenTree.ready.isImportingData():
 
-        # Schedule a background task to rebuild the parameters against this template
         if not created:
+            # Schedule a background task to rebuild the parameters against this template
             InvenTree.tasks.offload_task(
                 part_tasks.rebuild_parameters,
                 instance.pk,

InvenTree/part/tasks.py

@@ -7,6 +7,7 @@ import time
 from datetime import datetime, timedelta
 
 from django.contrib.auth.models import User
+from django.core.exceptions import ValidationError
 from django.core.files.base import ContentFile
 from django.utils.translation import gettext_lazy as _
 
@@ -18,6 +19,7 @@ from djmoney.money import Money
 import common.models
 import common.notifications
 import common.settings
+import company.models
 import InvenTree.helpers
 import InvenTree.tasks
 import part.models
@@ -433,7 +435,7 @@ def scheduled_stocktake_reports():
 def rebuild_parameters(template_id):
     """Rebuild all parameters for a given template.
 
-    This method is called when a base template is changed,
+    This function is called when a base template is changed,
     which may cause the base unit to be adjusted.
     """
 
@@ -452,7 +454,35 @@ def rebuild_parameters(template_id):
         parameter.calculate_numeric_value()
 
         if value_old != parameter.data_numeric:
+            parameter.full_clean()
             parameter.save()
             n += 1
 
     logger.info(f"Rebuilt {n} parameters for template '{template.name}'")
+
+
+def rebuild_supplier_parts(part_id):
+    """Rebuild all SupplierPart objects for a given part.
+
+    This function is called when a bart part is changed,
+    which may cause the native units of any supplier parts to be updated
+    """
+
+    try:
+        prt = part.models.Part.objects.get(pk=part_id)
+    except part.models.Part.DoesNotExist:
+        return
+
+    supplier_parts = company.models.SupplierPart.objects.filter(part=prt)
+
+    n = supplier_parts.count()
+
+    for supplier_part in supplier_parts:
+        # Re-save the part, to ensure that the units have updated correctly
+        try:
+            supplier_part.full_clean()
+            supplier_part.save()
+        except ValidationError:
+            pass
+
+    logger.info(f"Rebuilt {n} supplier parts for part '{prt.name}'")