Usecase to Unassign object aggregation in the ifcopenshell.api

src/blenderbim/blenderbim/bim/module/sequence/operator.py

@@ -44,6 +44,7 @@ class EditWorkPlan(bpy.types.Operator):
             **{"work_plan": self.file.by_id(props.active_work_plan_id), "attributes": attributes},
         )
         Data.load(IfcStore.get_file())
+        bpy.ops.bim.disable_editing_work_plan()
         return {"FINISHED"}
 
 

src/ifcopenshell-python/ifcopenshell/api/aggregate/unassign_object.py

@@ -0,0 +1,25 @@
+import ifcopenshell
+import ifcopenshell.api
+
+
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {
+            "relating_object": None,
+            "product": None,
+        }
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        for rel in self.settings["product"].Decomposes or []:
+            if not rel.is_a("IfcRelAggregates") or rel.RelatingObject != self.settings["relating_object"]:
+                continue
+            if len(rel.RelatedObjects) == 1:
+                return self.file.remove(rel)
+            related_objects = list(rel.RelatedObjects)
+            related_objects.remove(self.settings["product"])
+            rel.RelatedObjects = related_objects
+            ifcopenshell.api.run("owner.update_owner_history", self.file, **{"element": rel})
+            return rel