Fix issues with updating groups

src/blenderbim/blenderbim/bim/module/group/operator.py

@@ -46,9 +46,14 @@ class LoadGroups(bpy.types.Operator):
                 new.ifc_definition_id = ifc_definition_id
                 new.name = group["Name"]
                 new.selection_query = group["Description"].split("*selector*")[1] if group["Description"] else ""
-                new.has_children = True if len(group["IsGroupedBy"]) != 0 else False
                 new.tree_depth = 0
 
+                if group["IsGroupedBy"]:
+                    #  assumes 1:1 cardinality, will need to be updated to reflect IFC4 changes
+                    # where the cardinality is 0:? - vulevukusej     
+                    sub_groups = [g for g in group["IsGroupedBy"][0].RelatedObjects if g.is_a("IfcGroup")]
+                    new.has_children = True if len(sub_groups) != 0 else False
+
                 if self.is_refresh:
                     self.recursively_load_sub_groups(ifc_definition_id, new)
 
@@ -65,6 +70,7 @@ class LoadGroups(bpy.types.Operator):
             return
         else:
             parent.is_expanded = True
+            parent.has_children = True
             for group in sub_groups:
                 new = self.props.groups.add()
                 new.ifc_definition_id = group
@@ -144,6 +150,7 @@ class AddGroupToGroup(bpy.types.Operator):
         )
         Data.load(IfcStore.get_file())
         bpy.ops.bim.load_groups(is_refresh=True)
+        bpy.ops.bim.disable_group_editing_ui()
         return {"FINISHED"}
 
 
@@ -323,8 +330,9 @@ class UpdateGroup(bpy.types.Operator):
             "group.update_group_products",
             self.file,
             **{
-                "products": new_products,
                 "group": group,
+                "products": new_products,
+                
             }
         )
         Data.load(IfcStore.get_file())

src/blenderbim/blenderbim/bim/module/group/prop.py

@@ -43,7 +43,7 @@ class Group(PropertyGroup):
     ifc_definition_id: IntProperty(name="IFC Definition ID")
     selection_query: StringProperty(name="Selection Query")
     is_expanded: BoolProperty(name="Is Expanded", default=False)
-    has_children: BoolProperty(name="Has Children")
+    has_children: BoolProperty(name="Has Children", default=False)
     tree_depth: IntProperty(name="Tree Depth")
 
 

src/ifcopenshell-python/ifcopenshell/api/group/update_group_products.py

@@ -16,6 +16,9 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
 
+import ifcopenshell
+import ifcopenshell.api
+
 
 class Usecase:
     def __init__(self, file, **settings):
@@ -23,11 +26,27 @@ class Usecase:
         self.settings = {
             "group": None,
             "products": None,
-            }
+        }
         for key, value in settings.items():
             self.settings[key] = value
 
     def execute(self):
-        rel = self.settings["group"].IsGroupedBy[0]
+        if not self.settings["group"].IsGroupedBy:
-        rel.RelatedObjects = self.settings["products"]
+            return self.file.create_entity(
+                "IfcRelAssignsToGroup",
+                **{
+                    "GlobalId": ifcopenshell.guid.new(),
+                    "OwnerHistory": ifcopenshell.api.run("owner.create_owner_history", self.file),
+                    "RelatedObjects": self.settings["products"],
+                    "RelatingGroup": self.settings["group"],
+                }
+            )
+        else:
+            # assumes 1:1 cardinality, will need to be updated to reflect IFC4 changes
+            # where the cardinality is 0:? - vulevukusej
+            rel = self.settings["group"].IsGroupedBy[0]
+            existing_sub_groups = [g for g in rel.RelatedObjects if g.is_a("IfcGroup")]
 
+            rel.RelatedObjects = self.settings["products"]
+            for g in existing_sub_groups:
+                rel.RelatedObjects.add(g)