Improve error messages when loading fails

CHANGELOG.md

@@ -1,4 +1,8 @@
 # Changelog
+## 6.0.1
+### Fixes
+- Improve error messages when loading fails
+
 ## 6.0.0
 ### Breaking changes
 - Remove support for Python 3.8

configue/configue_loader.py

@@ -2,7 +2,7 @@
 import os
 import re
 from collections.abc import Hashable
-from typing import Any, List, Mapping, Union
+from typing import Any, List, Mapping, Optional, Union
 
 import yaml
 from yaml.constructor import ConstructorError
@@ -25,6 +25,7 @@ def construct_yaml_map(self, node: yaml.MappingNode) -> Any:
             path = mapping.pop(CONSTRUCTOR_KEY)
             object_path_elements = path.split(".")
             remaining_path_elements: List[str] = []
+            exceptions: list[Optional[str]] = []
             while object_path_elements:
                 try:
                     cls = self.find_python_name(
@@ -33,10 +34,13 @@ def construct_yaml_map(self, node: yaml.MappingNode) -> Any:
                         unsafe=True,
                     )
                     break
-                except ConstructorError:
+                except ConstructorError as error:
+                    exceptions.append(error.problem)
                     remaining_path_elements.insert(0, object_path_elements.pop(-1))
             else:
-                raise NotFoundError(f"Could not load element {path} {node.start_mark}")
+                raise NotFoundError(
+                    f"Could not load element {path} {node.start_mark}, exceptions encountered: {exceptions!r}"
+                ) from None
             for path_element in remaining_path_elements:
                 cls = getattr(cls, path_element)
 

configue/file_loader.py

@@ -120,6 +120,7 @@ def _load_ext(self, loader: ConfigueLoader, node: ScalarNode) -> Any:
         path = loader.construct_scalar(node)
         object_path_elements = path.split(".")
         remaining_path_elements: List[str] = []
+        exceptions: list[Optional[str]] = []
         while object_path_elements:
             try:
                 loaded_object = loader.find_python_name(
@@ -128,10 +129,13 @@ def _load_ext(self, loader: ConfigueLoader, node: ScalarNode) -> Any:
                     unsafe=True,
                 )
                 break
-            except ConstructorError:
+            except ConstructorError as error:
+                exceptions.append(error.problem)
                 remaining_path_elements.insert(0, object_path_elements.pop(-1))
         else:
-            raise NotFoundError(f"Could not load element {path} {node.start_mark}")
+            raise NotFoundError(
+                f"Could not load element {path} {node.start_mark}, encountered exceptions: {exceptions!r}"
+            ) from None
         remaining_path = ".".join(remaining_path_elements)
         if remaining_path:
             return self._get_element_at_sub_path(remaining_path, loaded_object)

tests/test_configue.py

@@ -3,7 +3,7 @@
 from unittest import TestCase
 
 import configue
-from configue.exceptions import NonCallableError, SubPathNotFound, NotFoundError
+from configue.exceptions import ConfigueError, NonCallableError, SubPathNotFound, NotFoundError
 from tests.external_module import CONSTANT, MyObject, Color
 
 
@@ -178,11 +178,11 @@ def test_ext_raises_exception_on_submodule_not_found(self):
             configue.load(self._get_path("test_file_2.yml"), "invalid_ext.wrong_sub_module")
 
     def test_ext_raises_exception_on_element_not_found(self):
-        with self.assertRaises(NotFoundError):
+        with self.assertRaises(ConfigueError):
             configue.load(self._get_path("test_file_2.yml"), "invalid_ext.wrong_element")
 
     def test_ext_raises_exception_on_property_not_found(self):
-        with self.assertRaises(NotFoundError):
+        with self.assertRaises(KeyError):
             configue.load(self._get_path("test_file_2.yml"), "invalid_ext.wrong_property")
 
     def test_loading_empty_file(self):

tests/test_file_2.yml

@@ -37,8 +37,8 @@ enum_loading: !ext tests.external_module.Color.RED
 invalid_ext:
   wrong_module: !ext invalid.test.Color.RED
   wrong_sub_module: !ext tests.invalid.Color.RED
-  wrong_element: !ext tests.invalid.Invalid.RED
-  wrong_property: !ext tests.invalid.Color.GREEN
+  wrong_element: !ext tests.external_module.Invalid.RED
+  wrong_property: !ext tests.external_module.Color.GREEN
 
 static_loading:
   (): tests.external_module.Static.get_static_value