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_group(
+    file: ifcopenshell.file, products: list[ifcopenshell.entity_instance], group: ifcopenshell.entity_instance
+) -> None:
+    """Unassigns products from a group
+
+    If the product isn't assigned to the group, nothing will happen.
+
+    :param products: A list of IfcProduct elements to unassign from the group
+    :param group: The IfcGroup to unassign from
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        group = ifcopenshell.api.group.add_group(model, name="Furniture")
+        furniture = model.by_type("IfcFurniture")
+        ifcopenshell.api.group.assign_group(model, products=furniture, group=group)
+
+        bad_furniture = furniture[0]
+        ifcopenshell.api.group.unassign_group(model, products=[bad_furniture], group=group)
+    """
+    if not group.IsGroupedBy:
+        return
+    rel = group.IsGroupedBy[0]
+    related_objects = set(rel.RelatedObjects) or set()
+    products_set = set(products)
+    related_objects -= products_set
+    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)