MPTT rebuild tweak (#10020)

* More efficient call

* Tree save fix

- Do not rebuild tree when not required
- Reduce DB count for API test

* Reduce query count even further

* Reduce query limit for other tests

* Fix for parent getter

* Added condition

* Remove duplicate check

* Don't pre-fill tree values

* perform atomic delete

* Adjust unit tests

src/backend/InvenTree/InvenTree/models.py

@@ -718,6 +718,7 @@ class InvenTreeTree(MPTTModel):
             if parent:
                 # If we have a parent, use the parent's tree_id
                 self.tree_id = parent.tree_id
+                self.level = parent.level + 1
             else:
                 # Otherwise, we need to generate a new tree_id
                 self.tree_id = self.getNextTreeID()
@@ -736,23 +737,27 @@ class InvenTreeTree(MPTTModel):
 
         trees = set()
 
+        parent = getattr(self, self.NODE_PARENT_KEY, None)
+
         if db_instance:
             # If the tree_id or parent has changed, we need to rebuild the tree
-            if getattr(db_instance, self.NODE_PARENT_KEY) != getattr(
+            if getattr(db_instance, self.NODE_PARENT_KEY) != parent:
-                self, self.NODE_PARENT_KEY
-            ):
                 trees.add(db_instance.tree_id)
             if db_instance.tree_id != self.tree_id:
                 trees.add(self.tree_id)
                 trees.add(db_instance.tree_id)
-        else:
+        elif parent:
-            # New instance, so we need to rebuild the tree
+            # New instance, so we need to rebuild the tree (if it has a parent)
             trees.add(self.tree_id)
 
         for tree_id in trees:
             if tree_id:
                 self.partial_rebuild(tree_id)
 
+        if len(trees) > 0:
+            # A tree update was performed, so we need to refresh the instance
+            self.refresh_from_db()
+
     def partial_rebuild(self, tree_id: int) -> bool:
         """Perform a partial rebuild of the tree structure.
 

src/backend/InvenTree/build/test_api.py

@@ -166,6 +166,7 @@ class BuildTest(BuildAPITest):
         # We shall complete 4 of these outputs
         outputs = self.build.incomplete_outputs.all()
 
+        # TODO: (2025-07-15) Try to optimize this API query to reduce DB hits
         self.post(
             self.url,
             {
@@ -174,7 +175,7 @@ class BuildTest(BuildAPITest):
                 'status': StockStatus.ATTENTION.value,
             },
             expected_code=201,
-            max_query_count=600,  # TODO: Try to optimize this
+            max_query_count=400,
         )
 
         self.assertEqual(self.build.incomplete_outputs.count(), 0)
@@ -976,7 +977,7 @@ class BuildOverallocationTest(BuildAPITest):
             self.url,
             {'accept_overallocated': 'accept'},
             expected_code=201,
-            max_query_count=1000,  # TODO: Come back and refactor this
+            max_query_count=375,
         )
 
         self.build.refresh_from_db()
@@ -995,7 +996,7 @@ class BuildOverallocationTest(BuildAPITest):
             self.url,
             {'accept_overallocated': 'trim'},
             expected_code=201,
-            max_query_count=1000,  # TODO: Come back and refactor this
+            max_query_count=375,
         )
 
         # Note: Large number of queries is due to pricing recalculation for each stock item

src/backend/InvenTree/build/tests.py

@@ -199,6 +199,8 @@ class BuildTreeTest(InvenTreeTestCase):
 
         # Test the tree structure for each node
         for idx, child in enumerate(builds):
+            child.refresh_from_db()
+
             # Check parent-child relationships
             expected_parent = builds[idx - 1] if idx > 0 else None
             self.assertEqual(child.parent, expected_parent)
@@ -278,12 +280,16 @@ class BuildTreeTest(InvenTreeTestCase):
                 self.assertEqual(grandchild.tree_id, self.build.tree_id)
                 self.assertEqual(grandchild.level, 2)
 
+            child.refresh_from_db()
+
             self.assertEqual(child.get_children().count(), 3)
             self.assertEqual(child.get_descendants(include_self=False).count(), 3)
 
             self.assertEqual(child.level, 1)
             self.assertEqual(child.tree_id, self.build.tree_id)
 
+        self.build.refresh_from_db()
+
         # Basic tests
         self.assertEqual(Build.objects.count(), 13)
         self.assertEqual(self.build.get_children().count(), 3)

src/backend/InvenTree/order/test_api.py

@@ -1182,8 +1182,7 @@ class PurchaseOrderReceiveTest(OrderTest):
 
         n = StockItem.objects.count()
 
-        # TODO: 2024-12-10 - This API query needs to be refactored!
+        self.post(self.url, data, expected_code=201, max_query_count=275)
-        self.post(self.url, data, expected_code=201, max_query_count=500)
 
         # Check that the expected number of stock items has been created
         self.assertEqual(n + 11, StockItem.objects.count())

src/backend/InvenTree/part/test_category.py

@@ -267,7 +267,13 @@ class CategoryTest(TestCase):
         and the correct ancestor tree is observed.
         """
         # Clear out any existing parts
-        Part.objects.all().delete()
+        for p in Part.objects.all():
+            if p.active:
+                p.refresh_from_db()
+                p.active = False
+                p.save()
+
+            p.delete()
 
         # First, create a structured tree of part categories
         A = PartCategory.objects.create(name='A', description='Top level category')

src/backend/InvenTree/plugin/base/event/events.py

@@ -73,19 +73,12 @@ def register_event(event, *args, **kwargs):
         registry.check_reload()
 
         with transaction.atomic():
-            for slug, plugin in registry.plugins.items():
+            for plugin in registry.with_mixin(PluginMixinEnum.EVENTS, active=True):
-                if not plugin.mixin_enabled(PluginMixinEnum.EVENTS):
-                    continue
-
-                # Only allow event registering for 'active' plugins
-                if not plugin.is_active():
-                    continue
-
                 # Let the plugin decide if it wants to process this event
                 if not plugin.wants_process_event(event):
                     continue
 
-                logger.debug("Registering callback for plugin '%s'", slug)
+                logger.debug("Registering callback for plugin '%s'", plugin.slug)
 
                 # This task *must* be processed by the background worker,
                 # unless we are running CI tests
@@ -94,7 +87,7 @@ def register_event(event, *args, **kwargs):
 
                 # Offload a separate task for each plugin
                 offload_task(
-                    process_event, slug, event, *args, group='plugin', **kwargs
+                    process_event, plugin.slug, event, *args, group='plugin', **kwargs
                 )
 
 

src/backend/InvenTree/stock/models.py

@@ -811,7 +811,7 @@ class StockItem(
         super().save(*args, **kwargs)
 
         # If user information is provided, and no existing note exists, create one!
-        if user and self.tracking_info.count() == 0:
+        if user and add_note and self.tracking_info.count() == 0:
             tracking_info = {'status': self.status}
 
             self.add_tracking_entry(