From 123557939f855cfbb29580e85327cdabca997071 Mon Sep 17 00:00:00 2001
From: Dion Moult <dion@thinkmoult.com>
Date: Mon, 20 Nov 2023 16:54:56 +1100
Subject: [PATCH] New ConvertNestToAggregate patch recipe

---
 .../recipes/ConvertNestToAggregate.py         | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 src/ifcpatch/ifcpatch/recipes/ConvertNestToAggregate.py

diff --git a/src/ifcpatch/ifcpatch/recipes/ConvertNestToAggregate.py b/src/ifcpatch/ifcpatch/recipes/ConvertNestToAggregate.py
new file mode 100644
index 0000000000..9e83df8211
--- /dev/null
+++ b/src/ifcpatch/ifcpatch/recipes/ConvertNestToAggregate.py
@@ -0,0 +1,34 @@
+class Patcher:
+    def __init__(self, src, file, logger):
+        """Convert nesting relationships to aggregate relationships
+
+        Some software like Revit won't load nested children elements because
+        they (incorrectly) don't consider it to be part of the spatial tree.
+        For example, 12D software will use nesting.
+
+        This patch converts all nest relationships into aggregate
+        relationships.
+
+        See bug: https://github.com/Autodesk/revit-ifc/issues/706
+
+        Example:
+
+        .. code:: python
+
+            ifcpatch.execute({"input": model, "recipe": "ConvertNestToAggregate", "arguments": []})
+        """
+        self.src = src
+        self.file = file
+        self.logger = logger
+
+    def patch(self):
+        for rel in self.file.by_type("IfcRelNests"):
+            new = self.file.createIfcRelAggregates(
+                ifcopenshell.guid.new(),
+                rel.OwnerHistory,
+                rel.Name,
+                rel.Description,
+                rel.RelatingObject,
+                rel.RelatedObjects,
+            )
+            self.file.remove(rel)