WIP assigning a class also assigns the spatial container if possible. See #1222.

src/ifcblenderexport/blenderbim/bim/module/spatial/assign_container.py

@@ -15,7 +15,7 @@ class Usecase:
         contained_in_structure = self.settings["product"].ContainedInStructure
         contains_elements = self.settings["relating_structure"].ContainsElements
 
-        if contained_in_structure == contains_elements:
+        if contains_elements and contained_in_structure == contains_elements:
             return
 
         if contained_in_structure:

src/ifcblenderexport/blenderbim/bim/module/spatial/data.py

@@ -10,9 +10,8 @@ class Data:
         if not file:
             return
         product = file.by_id(product_id)
-        element = product.ContainedInStructure[0].RelatingStructure if product.ContainedInStructure else None
-        cls.products[product_id] = {
-            "type": element.is_a() if element else None,
-            "Name": element.Name if element else None,
-            "id": int(element.id()) if element else None
-        }
+        if product.ContainedInStructure:
+            structure = product.ContainedInStructure[0].RelatingStructure
+            cls.products[product_id] = {"type": structure.is_a(), "Name": structure.Name, "id": int(structure.id())}
+        else:
+            cls.products[product_id] = {"type": None, "Name": None, "id": None}

src/ifcblenderexport/blenderbim/bim/module/spatial/operator.py

@@ -18,6 +18,7 @@ class AssignContainer(bpy.types.Operator):
                 relating_structure = self.file.by_id(
                     bpy.data.objects.get(collection.name).BIMObjectProperties.ifc_definition_id
                 )
+                break
         if not relating_structure:
             return {"FINISHED"}
         usecase = assign_container.Usecase(