fix: preserve shared rack units during import

README.md

@@ -287,6 +287,13 @@ Test- und Echtimport auch unter PostgreSQL, ohne einen unzulässigen
 `FOR UPDATE`-Outer-Join zu erzeugen. Bereits mit Version `0.9.9` erstellte
 Archive müssen dafür nicht neu exportiert werden.
 
+Ab Version `0.9.11` werden alle im Archiv enthaltenen Rackbreiten vor der
+eigentlichen Geräteplatzierung innerhalb derselben Transaktion vorgemerkt.
+Dadurch erkennt die Konfliktprüfung mehrere teilbreite Geräte derselben HE
+bereits während des Imports korrekt und löst kein zuvor platziertes Gerät aus
+dem Rack. Nach der Platzierung werden die Breiten mit dem endgültigen
+Importergebnis abgeglichen.
+
 ### Teilbreiten in MrBlake NetBox Topology Views
 
 Ist

netbox_utilities/__init__.py

@@ -1,6 +1,6 @@
 from netbox.plugins import PluginConfig, get_plugin_config
 
-__version__ = "0.9.10"
+__version__ = "0.9.11"
 
 
 class NetBoxUtilitiesConfig(PluginConfig):

netbox_utilities/netbox_export.py

@@ -141,12 +141,26 @@ def _apply_rack_widths(original, placements, resolved, resolver, compatibility,
         stage_width_position(device, placement.width, placement.horizontal_position)
         width_aware.append((device, placement))
 
+    # The native placement pass reloads rack occupants from the database for
+    # every device. Persist all imported widths first so a device placed early
+    # in the same pass is not mistaken for a full-width conflict later on.
+    for device, placement in width_aware:
+        _save_rack_width(device, placement)
+
     result = original(placements, resolved, resolver, compatibility, **kwargs)
 
     for device, placement in width_aware:
         if placement.width == FULL_WIDTH or not device.rack_id or not device.position:
             DeviceRackPlacement.objects.filter(device=device).delete()
         else:
+            _save_rack_width(device, placement)
+    return result
+
+
+def _save_rack_width(device, placement):
+    if placement.width == FULL_WIDTH:
+        DeviceRackPlacement.objects.filter(device=device).delete()
+        return
     DeviceRackPlacement.objects.update_or_create(
         device=device,
         defaults={
@@ -154,7 +168,6 @@ def _apply_rack_widths(original, placements, resolved, resolver, compatibility,
             "horizontal_position": placement.horizontal_position,
         },
     )
-    return result
 
 
 def _rack_placement_is_exportable(original, model):

netbox_utilities/tests/test_netbox_export.py

@@ -30,7 +30,12 @@ class FakeQuerySet(list):
         return self
 
     def filter(self, **kwargs):
-        return self
+        values = self
+        if kwargs.get("position__isnull") is False:
+            values = [item for item in values if item.position is not None]
+        result = FakeQuerySet(values)
+        result.selected_related = self.selected_related
+        return result
 
     def exclude(self, **kwargs):
         pk = kwargs.get("pk")
@@ -155,6 +160,12 @@ class NetBoxExportRackWidthTest(SimpleTestCase):
             self.assertEqual(received, placements)
             self.assertEqual(partial._netbox_utilities_rack_width, 2)
             self.assertEqual(full._netbox_utilities_rack_width, 1)
+            placement_objects.update_or_create.assert_called_once_with(
+                device=partial,
+                defaults={"width": 2, "horizontal_position": 1},
+            )
+            placement_objects.filter.assert_called_once_with(device=full)
+            placement_objects.filter.return_value.delete.assert_called_once_with()
             partial.rack_id = full.rack_id = 1
             partial.position = 11
             full.position = 12
@@ -163,12 +174,73 @@ class NetBoxExportRackWidthTest(SimpleTestCase):
         result = _apply_rack_widths(native_apply, placements, resolved, object(), object())
 
         self.assertEqual(result, "saved")
-        placement_objects.update_or_create.assert_called_once_with(
+        self.assertEqual(placement_objects.update_or_create.call_count, 2)
-            device=partial,
+        self.assertEqual(placement_objects.filter.call_count, 2)
-            defaults={"width": 2, "horizontal_position": 1},
+        self.assertEqual(placement_objects.filter.return_value.delete.call_count, 2)
+
+    @patch("netbox_utilities.netbox_export.DeviceRackPlacement.objects")
+    def test_import_preloads_all_partial_widths_before_native_placement(self, placement_objects):
+        left = FakeDevice(1)
+        right = FakeDevice(2)
+        placements = [
+            ("left", WidthAwareDeferredDevicePlacement(None, 11, "front", 2, 1)),
+            ("right", WidthAwareDeferredDevicePlacement(None, 11, "front", 2, 2)),
+        ]
+        resolved = {"left": left, "right": right}
+
+        def native_apply(*_args, **_kwargs):
+            self.assertEqual(placement_objects.update_or_create.call_count, 2)
+            self.assertEqual(
+                [call.kwargs["device"] for call in placement_objects.update_or_create.call_args_list],
+                [left, right],
             )
-        placement_objects.filter.assert_called_once_with(device=full)
+            left.rack_id = right.rack_id = 1
-        placement_objects.filter.return_value.delete.assert_called_once_with()
+            left.position = right.position = 11
+
+        _apply_rack_widths(native_apply, placements, resolved, object(), object())
+
+        self.assertEqual(placement_objects.update_or_create.call_count, 4)
+
+    @patch("netbox_utilities.netbox_export.DeviceRackPlacement.objects")
+    def test_two_partial_devices_remain_in_the_same_unit_during_import(self, placement_objects):
+        left = FakeDevice(1)
+        right = FakeDevice(2)
+        FakeDevice._default_manager = FakeQuerySet([left, right])
+        placements = [
+            ("left", WidthAwareDeferredDevicePlacement(None, 11, "front", 2, 1)),
+            ("right", WidthAwareDeferredDevicePlacement(None, 11, "front", 2, 2)),
+        ]
+        resolved = {"left": left, "right": right}
+        stored = {}
+
+        def store_width(*, device, defaults):
+            stored[device.pk] = SimpleNamespace(device_id=device.pk, **defaults)
+
+        def locked_widths(**kwargs):
+            return [stored[pk] for pk in kwargs["device_id__in"] if pk in stored]
+
+        placement_objects.update_or_create.side_effect = store_width
+        placement_objects.select_for_update.return_value.filter.side_effect = locked_widths
+
+        def native_apply(received, *_args, **_kwargs):
+            for record_id, placement in received:
+                device = resolved[record_id]
+                conflicts = _width_aware_device_placement_conflicts(
+                    MagicMock(),
+                    device,
+                    object(),
+                    placement.position,
+                    placement.face,
+                )
+                self.assertEqual(conflicts, [])
+                device.rack_id = 1
+                device.position = placement.position
+                device.face = placement.face
+
+        _apply_rack_widths(native_apply, placements, resolved, object(), object())
+
+        self.assertEqual(left.position, 11)
+        self.assertEqual(right.position, 11)
 
     @patch("netbox_utilities.netbox_export.import_module")
     @patch("netbox_utilities.netbox_export.apps.get_app_config")

netbox_utilities/tests/test_reorder_rack.py

@@ -449,7 +449,7 @@ class ReorderRackFrontendTest(SimpleTestCase):
         self.assertEqual(template_name, "netbox_utilities/reorder_rack.html")
         self.assertEqual(context["reorder_devices"][0]["label"], "LEO-Fritzbox")
         self.assertEqual(context["reorder_devices"][0]["grid_width"], 6)
-        self.assertEqual(context["asset_version"], "0.9.10")
+        self.assertEqual(context["asset_version"], "0.9.11")
         self.assertIs(context["reorder_rack_width_data"], get_width_data.return_value)
         get_width_data.assert_called_once()
         self.assertIs(get_width_data.call_args.kwargs["rack"], rack)

netbox_utilities/tests/test_topology_views.py

@@ -246,7 +246,7 @@ class TopologyViewsRackWidthTest(SimpleTestCase):
         self.assertIn('id="netbox-utilities-topology-rack-width-styles"', html)
         self.assertIn('.rack-device[href="/dcim/devices/334/"]', html)
         self.assertIn("left: calc(50% + 3px) !important", html)
-        self.assertIn("netbox_utilities/topology-rack-width.js?v=0.9.10", html)
+        self.assertIn("netbox_utilities/topology-rack-width.js?v=0.9.11", html)
         self.assertIn("left:calc(0% + 3px)!important", html)
         self.assertIn("left:calc(50% + 3px)!important", html)
         self.assertIn("width:calc(50% - 6px)!important", html)

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "netbox-utilities"
-version = "0.9.10"
+version = "0.9.11"
 description = "Navigation, tenant utilities, partial-width rack devices, bulk uploads, and rack reordering for NetBox 4.6"
 readme = "README.md"
 requires-python = ">=3.12"