Proposal to use resource's parent cost, reducing manual insertions

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

@@ -18,6 +18,7 @@
 
 import ifcopenshell.api
 import ifcopenshell.util.date
+import ifcopenshell.util.resource
 
 
 class Usecase:
@@ -105,8 +106,10 @@ class Usecase:
 
         total_cost = 0
         for resource in resources:
-            cost = self.get_cost(resource)
-            quantity = self.get_quantity(resource)
+            cost = ifcopenshell.util.resource.get_cost(resource)
+            quantity = ifcopenshell.util.resource.get_quantity(resource)
+            if not cost:
+                cost = ifcopenshell.util.resource.get_parent_cost(resource) # Concept to standardise - Not defined in schema, but this makes manual scheduling of resources 10x faster and less duplicate data.
             if not cost or not quantity:
                 continue
             total_cost += cost * quantity
@@ -114,20 +117,3 @@ class Usecase:
         if total_cost:
             cost_value = ifcopenshell.api.run("cost.add_cost_value", self.file, parent=self.settings["cost_item"])
             cost_value.AppliedValue = self.file.createIfcMonetaryMeasure(total_cost)
-
-    def get_cost(self, resource):
-        total = 0
-        for cost_value in resource.BaseCosts or []:
-            total += cost_value.AppliedValue.wrappedValue if cost_value.AppliedValue else 0
-        return total
-
-    def get_quantity(self, resource):
-        total = 0
-        if resource.BaseQuantity:
-            return resource.BaseQuantity[3]
-        if resource.Usage and resource.Usage.ScheduleWork:
-            # For now we assume either hourly or daily depending on how duration is stored
-            duration = ifcopenshell.util.date.ifc2datetime(resource.Usage.ScheduleWork)
-            if duration.days:
-                return duration.days
-            return duration.seconds / 60 / 60

src/ifcopenshell-python/ifcopenshell/util/resource.py

@@ -113,5 +113,32 @@ def get_resource_required_work(resource):
             iso_string = f"P{required_work}D"
         return iso_string
 
+
 def get_nested_resources(resource):
     return [object for rel in resource.IsNestedBy or [] for object in rel.RelatedObjects]
+
+
+def get_cost(resource):
+    total = 0
+    for cost_value in resource.BaseCosts or []:
+        total += cost_value.AppliedValue.wrappedValue if cost_value.AppliedValue else 0
+    return total
+
+
+def get_quantity(resource):
+    total = 0
+    if resource.BaseQuantity:
+        return resource.BaseQuantity[3]
+    if resource.Usage and resource.Usage.ScheduleWork:
+        # For now we assume either hourly or daily depending on how duration is stored
+        duration = ifcopenshell.util.date.ifc2datetime(resource.Usage.ScheduleWork)
+        if duration.days:
+            return duration.days
+        return duration.seconds / 60 / 60
+
+def get_parent_cost(resource):
+    if not resource.Nests:
+        return
+    else:
+        cost = get_cost(resource.Nests[0].RelatingObject)
+        return cost