add method to data class to retrieve ifc class name

src/blenderbim/blenderbim/bim/module/aggregate/data.py

@@ -35,6 +35,7 @@ class AggregateData:
             "has_aggregate": cls.has_aggregate(),
             "label": cls.get_label(),
             "relating_object_id": cls.get_relating_object_id(),
+            "ifc_class": cls.ifc_class(),
         }
         cls.is_loaded = True
 
@@ -53,3 +54,9 @@ class AggregateData:
         aggregate = ifcopenshell.util.element.get_aggregate(tool.Ifc.get_entity(bpy.context.active_object))
         if aggregate:
             return aggregate.id()
+
+    @classmethod
+    def ifc_class(cls):
+        element = tool.Ifc.get_entity(bpy.context.active_object)
+        if element:
+            return element.is_a()

src/blenderbim/blenderbim/bim/module/aggregate/ui.py

@@ -19,7 +19,6 @@
 from bpy.types import Panel
 from blenderbim.bim.module.aggregate.data import AggregateData
 from blenderbim.bim.ifc import IfcStore
-from blenderbim.bim.module.root.data import IfcClassData
 
 
 class BIM_PT_aggregate(Panel):
@@ -73,8 +72,6 @@ class BIM_PT_aggregate(Panel):
                 row.operator("bim.enable_editing_aggregate", icon="GREASEPENCIL", text="")
                 row.operator("bim.add_aggregate", icon="ADD", text="")
 
-        if not IfcClassData.is_loaded:
-            IfcClassData.load()
-        ifc_class = IfcClassData.data["ifc_class"]
+        ifc_class = AggregateData.data["ifc_class"]
         if ifc_class == "IfcBuilding":
             layout.operator("bim.building_storey_add")