cost web ui:

- add "Linked rate" column,
- assign a cost rate to multiple cost items by selecting linked rate cells & clicking the "assign" button on the chosen cost rate
#5369

src/ifc5d/ifc5d/ifc2json.py

@@ -55,11 +55,17 @@ class ifc5D2json:
         self.extract_cost_item_quantities(cost_item, data)
         self.populate_cost_values(cost_item, data)
         self.populate_nesting_index(cost_item, data)
+        cost_rate = ifcopenshell.util.cost.get_cost_rate(self.file, cost_item)
         data = {**data, **cost_item.get_info(recursive=True)}
         data["id"] = cost_item.id()
         data["IsNestedBy"] = []
         data["IsSum"] = self.check_if_cost_item_is_sum(cost_item)
         data["Classification"] = self.get_cost_classifications(cost_item)
+        data["CostRate"] = {
+            "id": cost_rate.id() if cost_rate else None,
+            "Identification": cost_rate.Identification if cost_rate else None,
+            "Name": cost_rate.Name if cost_rate else None,
+        }
         json_data.append(data)
         for rel in cost_item.IsNestedBy or []:
             for sub_cost in rel.RelatedObjects: