73 lines
2.8 KiB
Python
73 lines
2.8 KiB
Python
# IfcOpenShell - IFC toolkit and geometry engine
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# Copyright (C) 2021 Dion Moult <dion@thinkmoult.com>
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#
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# This file is part of IfcOpenShell.
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#
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# IfcOpenShell is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# IfcOpenShell is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with IfcOpenShell. If not, see <http://www.gnu.org/licenses/>.
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import ifcopenshell
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import ifcopenshell.api.owner
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import ifcopenshell.util.element
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def unassign_process(
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file: ifcopenshell.file,
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relating_process: ifcopenshell.entity_instance,
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related_object: ifcopenshell.entity_instance,
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) -> None:
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"""Unassigns a process and object relationship
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See ifcopenshell.api.sequence.assign_process for details.
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:param relating_process: The IfcTask in the relationship.
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:param related_object: The related object.
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:return: None
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Example:
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.. code:: python
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# Let's imagine we are creating a construction schedule. All tasks
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# need to be part of a work schedule.
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schedule = ifcopenshell.api.sequence.add_work_schedule(model, name="Construction Schedule A")
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# Let's create a construction task. Note that the predefined type is
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# important to distinguish types of tasks.
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task = ifcopenshell.api.sequence.add_task(model,
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work_schedule=schedule, name="Demolish existing", identification="A", predefined_type="DEMOLITION")
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# Let's say we have a wall somewhere.
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wall = ifcopenshell.api.root.create_entity(model, ifc_class="IfcWall")
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# Let's demolish that wall!
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ifcopenshell.api.sequence.assign_process(model, relating_process=task, related_object=wall)
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# Change our mind.
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ifcopenshell.api.sequence.unassign_process(model, relating_process=task, related_object=wall)
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"""
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for rel in related_object.HasAssignments or []:
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if not rel.is_a("IfcRelAssignsToProcess") or rel.RelatingProcess != relating_process:
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continue
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if len(rel.RelatedObjects) == 1:
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history = rel.OwnerHistory
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file.remove(rel)
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if history:
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ifcopenshell.util.element.remove_deep2(file, history)
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return
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related_objects = list(rel.RelatedObjects)
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related_objects.remove(related_object)
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rel.RelatedObjects = related_objects
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ifcopenshell.api.owner.update_owner_history(file, element=rel)
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return rel
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