Implement duplicate action for stock item

src/backend/InvenTree/stock/api.py

@@ -1250,9 +1250,28 @@ class StockList(
         serializer = self.get_serializer(data=data)
         serializer.is_valid(raise_exception=True)
 
+        # Extract 'duplicate' options (if provided) - these are not valid model fields
+        duplicate = serializer.validated_data.pop('duplicate', None)
+
         # Extract location information
         location = serializer.validated_data.get('location', None)
 
+        def apply_duplicate_options(item):
+            """Apply any provided 'duplicate' options to a newly created StockItem."""
+            if not duplicate:
+                return
+
+            original = duplicate['original']
+
+            if duplicate.get('copy_notes', True):
+                item.copy_notes_from(original)
+
+            if duplicate.get('copy_history', False):
+                item.copyHistoryFrom(original)
+
+            if duplicate.get('copy_tests', False):
+                item.copyTestResultsFrom(original)
+
         with transaction.atomic():
             if serials:
                 # Create multiple serialized StockItem objects
@@ -1268,6 +1287,8 @@ class StockList(
                         item.set_status(status_value)
                         item.save()
 
+                    apply_duplicate_options(item)
+
                     if entry := item.add_tracking_entry(
                         StockHistoryCode.CREATED,
                         user,
@@ -1300,6 +1321,8 @@ class StockList(
                 item.save(user=user)
                 item.refresh_from_db()
 
+                apply_duplicate_options(item)
+
                 response_data = [
                     StockSerializers.StockItemSerializer(
                         item, context=self.get_serializer_context()

src/backend/InvenTree/stock/serializers.py

@@ -324,6 +324,8 @@ class StockItemSerializer(
 
     export_exclude_fields = ['tags', 'tracking_items']
 
+    SKIP_CREATE_FIELDS = ['duplicate']
+
     export_child_fields = [
         'part_detail.name',
         'part_detail.description',
@@ -380,6 +382,7 @@ class StockItemSerializer(
             'purchase_price_currency',
             'use_pack_size',
             'serial_numbers',
+            'duplicate',
             # Annotated fields
             'allocated',
             'expired',
@@ -467,6 +470,28 @@ class StockItemSerializer(
         help_text=_('Enter serial numbers for new items'),
     )
 
+    # Extra field used only for creation of a new StockItem instance
+    duplicate = InvenTree.serializers.DuplicateOptionsSerializer(
+        StockItem.objects.all(),
+        label=_('Duplicate Stock Item'),
+        help_text=_('Copy initial data from another stock item'),
+        copy_notes=True,
+        copy_fields=[
+            {
+                'name': 'copy_tests',
+                'label': _('Copy Test Results'),
+                'help_text': _('Copy test results from the original stock item'),
+                'default': False,
+            },
+            {
+                'name': 'copy_history',
+                'label': _('Copy History'),
+                'help_text': _('Copy stock history from the original stock item'),
+                'default': False,
+            },
+        ],
+    )
+
     def validate_part(self, part):
         """Ensure the provided Part instance is valid."""
         if part.virtual: