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_process(
+    file: ifcopenshell.file,
+    relating_process: ifcopenshell.entity_instance,
+    related_object: ifcopenshell.entity_instance,
+) -> None:
+    """Unassigns a process and object relationship
+
+    See ifcopenshell.api.sequence.assign_process for details.
+
+    :param relating_process: The IfcTask in the relationship.
+    :param related_object: The related object.
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        # Let's imagine we are creating a construction schedule. All tasks
+        # need to be part of a work schedule.
+        schedule = ifcopenshell.api.sequence.add_work_schedule(model, name="Construction Schedule A")
+
+        # Let's create a construction task. Note that the predefined type is
+        # important to distinguish types of tasks.
+        task = ifcopenshell.api.sequence.add_task(model,
+            work_schedule=schedule, name="Demolish existing", identification="A", predefined_type="DEMOLITION")
+
+        # Let's say we have a wall somewhere.
+        wall = ifcopenshell.api.root.create_entity(model, ifc_class="IfcWall")
+
+        # Let's demolish that wall!
+        ifcopenshell.api.sequence.assign_process(model, relating_process=task, related_object=wall)
+
+        # Change our mind.
+        ifcopenshell.api.sequence.unassign_process(model, relating_process=task, related_object=wall)
+    """
+    for rel in related_object.HasAssignments or []:
+        if not rel.is_a("IfcRelAssignsToProcess") or rel.RelatingProcess != relating_process:
+            continue
+        if len(rel.RelatedObjects) == 1:
+            history = rel.OwnerHistory
+            file.remove(rel)
+            if history:
+                ifcopenshell.util.element.remove_deep2(file, history)
+            return
+        related_objects = list(rel.RelatedObjects)
+        related_objects.remove(related_object)
+        rel.RelatedObjects = related_objects
+        ifcopenshell.api.owner.update_owner_history(file, element=rel)
+        return rel