First Commit

2026-05-31 10:17:09 +07:00
commit 17a9c69379
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+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2021 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of IfcOpenShell.
+#
+# IfcOpenShell is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# IfcOpenShell is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
+
+import ifcopenshell
+import ifcopenshell.api.owner
+import ifcopenshell.util.element
+
+
+def unassign_object(file: ifcopenshell.file, products: list[ifcopenshell.entity_instance]) -> None:
+    """Unassigns products from their aggregate
+
+    A product (i.e. a smaller part of a whole) may be aggregated into zero
+    or one larger space or element. This function will remove that
+    aggregation relationship.
+
+    As all physical IFC model elements must be part of a hierarchical tree
+    called the "spatial decomposition", using this function will remove the
+    product from that tree. This is a dangerous operation and may result in
+    the product no longer being visible in IFC applications.
+
+    If the product is not part of an aggregation relationship, nothing will
+    happen.
+
+    :param products: The list of parts of the aggregate, typically of IfcElements or
+        IfcSpatialStructureElement subclass
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        element = ifcopenshell.api.root.create_entity(model, ifc_class="IfcSite")
+        subelement1 = ifcopenshell.api.root.create_entity(model, ifc_class="IfcBuilding")
+        subelement2 = ifcopenshell.api.root.create_entity(model, ifc_class="IfcBuilding")
+        ifcopenshell.api.aggregate.assign_object(model, products=[subelement1], relating_object=element)
+        ifcopenshell.api.aggregate.assign_object(model, products=[subelement2], relating_object=element)
+        # nothing is returned
+        ifcopenshell.api.aggregate.unassign_object(model, products=[subelement1])
+        # nothing is returned, relationship is removed
+        ifcopenshell.api.aggregate.unassign_object(model, products=[subelement2])
+    """
+    settings = {"products": products}
+
+    products = set(settings["products"])
+    rels = set(
+        rel
+        for product in products
+        if (rel := next((rel for rel in product.Decomposes if rel.is_a("IfcRelAggregates")), None))
+    )
+
+    for rel in rels:
+        related_objects = set(rel.RelatedObjects) - products
+        if related_objects:
+            rel.RelatedObjects = list(related_objects)
+            ifcopenshell.api.owner.update_owner_history(file, element=rel)
+        else:
+            history = rel.OwnerHistory
+            file.remove(rel)
+            if history:
+                ifcopenshell.util.element.remove_deep2(file, history)