ifcopenshell.api.library.assign_reference

Module Contents

ifcopenshell.api.library.assign_reference.assign_reference(file: ifcopenshell.file, products: ifcopenshell.entity_instance, reference: ifcopenshell.entity_instance) → ifcopenshell.entity_instance | None

Associates a list products with a library reference

A product may be associated with zero, one, or many references across multiple libraries. See ifcopenshell.api.library.add_reference for more detail about how references work.

Parameters:

• products (list[ifcopenshell.entity_instance]) – The list of IfcProducts you want to associate with the reference

• reference (ifcopenshell.entity_instance) – The IfcLibraryReference you want the product to be associated with.

Returns:

The IfcRelAssociatesLibrary relationship entity or None if products was an empty list or all products were already assigned to the reference.

Return type:

Union[ifcopenshell.entity_instance, None]

Example:

library = ifcopenshell.api.library.add_library(model, name="Brickschema")

# Let's create a reference to a single AHU in our Brickschema dataset
reference = ifcopenshell.api.library.add_reference(model, library=library)
ifcopenshell.api.library.edit_reference(model,
    reference=reference, attributes={"Identification": "http://example.org/digitaltwin#AHU01"})

# Let's assume we have an AHU in our model.
ahu = ifcopenshell.api.root.create_entity(model,
    ifc_class="IfcUnitaryEquipment", predefined_type="AIRHANDLER")

# And now assign the IFC model's AHU with its Brickschema counterpart
ifcopenshell.api.library.assign_reference(model, reference=reference, products=[ahu])