src/rougail/convert/object_model.py

@@ -485,7 +485,7 @@ class JinjaCalculation(Calculation):
 
 class _VariableCalculation(Calculation):
     variable: StrictStr
-    propertyerror: bool = True
+    propertyerror: Union[Literal["transitive"], bool] = True
     allow_none: bool = False
     optional: bool = False
 

src/rougail/convert/tiramisureflector.py

@@ -372,8 +372,11 @@ class Common:
                 params.append("optional=True")
         else:
             param_type = "ParamOption"
-        if not param.get("propertyerror", True):
+        propertyerror = param.get("propertyerror", True)
+        if not propertyerror:
             params.append("notraisepropertyerror=True")
+        elif propertyerror == "transitive":
+            params.append("raisepropertyerror=True")
         return f'{param_type}({", ".join(params)})'
 
     def calculation_value(

src/rougail/user_data.py

@@ -353,17 +353,32 @@ class UserData:
                     _("{0}, it has been loaded from {1}").format(err, options["source"]): option._subconfig}
                 )
                 continue
+
             except AttributeOptionError as err:
                 if err.code == "option-not-found":
+                    err_path = err.path
+                    if "." not in err_path:
+                        subconfig = None
+                        child_name = err_path
+                    else:
+                        parent_path, child_name = err_path.rsplit('.', 1)
+                        subconfig = self.config.option(parent_path)
+                        subconfig._set_subconfig()
+                    err_msg = _(
+                        'variable or family "{0}" does not exist so cannot load "{1}'
+                        ).format(child_name, path)
                     if self.unknown_user_data_error:
                         msg = _(
-                            'variable or family "{0}" does not exist, it has been loading from {1}'
+                            '{0}, it has been loading from {1}'
                             )
                     else:
                         msg = _(
-                            'variable or family "{0}" does not exist, it will be ignored when loading from {1}'
+                            '{0}, it will be ignored when loading from {1}'
                             )
-                    self.unknowns.append(msg.format(err.path, options["source"]))
+                    msg = msg.format(err_msg, options["source"])
+                    if subconfig is not None:
+                        msg = {msg: subconfig._subconfig}
+                    self.unknowns.append(msg)
                 elif err.code == "option-dynamic":
                     if self.invalid_user_data_error:
                         msg = _(
@@ -373,9 +388,7 @@ class UserData:
                         msg = _(
                         '"{0}" is the name of a dynamic family, it will be ignored when loading from {1}'
                         )
-                    self.invalids.append(
-                            {msg.format(option.description(with_quote=True), options["source"]): option._subconfig}
-                    )
+                    self.invalids.append({msg.format(option.description(with_quote=True), options["source"]): option._subconfig})
                 else:
                     self.invalids.append(
                         _("{0} loaded from {1}").format(err, options["source"])