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_resource(
+    file: ifcopenshell.file,
+    relating_resource: ifcopenshell.entity_instance,
+    related_object: ifcopenshell.entity_instance,
+) -> None:
+    """Removes the relationship between a resource and object
+
+    :param relating_resource: The IfcResource to assign the object to.
+    :param related_object: The IfcProduct or IfcActor to assign to the
+        object.
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        # Add our own crew
+        crew = ifcopenshell.api.resource.add_resource(model, ifc_class="IfcCrewResource")
+
+        # Add some a tower crane to our crew.
+        crane = ifcopenshell.api.resource.add_resource(model,
+            parent_resource=crew, ifc_class="IfcConstructionEquipmentResource", name="Tower Crane 01")
+
+        # Our tower crane will be placed via this physical product.
+        product = ifcopenshell.api.root.create_entity(model,
+            ifc_class="IfcBuildingElementProxy", predefined_type="CRANE")
+
+        # Let's assign our crane to the resource. The crane now represents
+        # the resource.
+        ifcopenshell.api.resource.assign_resource(model,
+            relating_resource=crane, related_object=product)
+
+        # Undo it.
+        ifcopenshell.api.resource.unassign_resource(model,
+            relating_resource=crane, related_object=product)
+    """
+    for rel in related_object.HasAssignments or []:
+        if not rel.is_a("IfcRelAssignsToResource") or rel.RelatingResource != relating_resource:
+            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)