Linked cost item products now auto update cost quantities upon assignment and unassignment, with user friendly quantity type selection dropdown

src/ifcopenshell-python/ifcopenshell/api/cost/assign_cost_item_product.py

@@ -0,0 +1,31 @@
+import ifcopenshell.api
+
+
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {"cost_item": None, "products": []}
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        quantity_names = set()
+        for quantity in self.settings["cost_item"].CostQuantities or []:
+            if quantity.Name:
+                quantity_names.add(quantity.Name)
+
+        for product in self.settings["products"]:
+            ifcopenshell.api.run(
+                "control.assign_control",
+                self.file,
+                related_object=product,
+                relating_control=self.settings["cost_item"],
+            )
+
+        for name in quantity_names:
+            ifcopenshell.api.run(
+                "cost.assign_cost_item_product_quantities",
+                self.file,
+                cost_item=self.settings["cost_item"],
+                prop_name=name
+            )

src/ifcopenshell-python/ifcopenshell/api/cost/assign_cost_item_product_quantities.py

@@ -4,7 +4,7 @@ import ifcopenshell.api
 class Usecase:
     def __init__(self, file, **settings):
         self.file = file
-        self.settings = {"cost_item": None, "qto_name": "", "prop_name": ""}
+        self.settings = {"cost_item": None, "prop_name": ""}
         for key, value in settings.items():
             self.settings[key] = value
 
@@ -25,7 +25,7 @@ class Usecase:
                     self.add_quantity_from_qto(relationship.RelatingPropertyDefinition)
 
     def add_quantity_from_qto(self, qto):
-        if not qto.is_a("IfcElementQuantity") or qto.Name.lower() != self.settings["qto_name"].lower():
+        if not qto.is_a("IfcElementQuantity"):
             return
         for prop in qto.Quantities:
             if prop.is_a("IfcPhysicalSimpleQuantity") and prop.Name.lower() == self.settings["prop_name"].lower():

src/ifcopenshell-python/ifcopenshell/api/cost/unassign_cost_item_product.py

@@ -0,0 +1,29 @@
+import ifcopenshell.api
+
+
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {"cost_item": None, "products": []}
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        self.quantities = set(self.settings["cost_item"].CostQuantities or [])
+        for quantity in self.settings["cost_item"].CostQuantities or []:
+            for inverse in self.file.get_inverse(quantity):
+                if not inverse.is_a("IfcElementQuantity"):
+                    continue
+                for rel in inverse.DefinesOccurrence or []:
+                    for related_object in rel.RelatedObjects:
+                        if related_object in self.settings["products"]:
+                            self.quantities.remove(quantity)
+        self.settings["cost_item"].CostQuantities = list(self.quantities)
+
+        for product in self.settings["products"]:
+            ifcopenshell.api.run(
+                "control.unassign_control",
+                self.file,
+                related_object=product,
+                relating_control=self.settings["cost_item"],
+            )