Merge pull request #697 from kindlycat/sub_task_exception

Store original metadata error when exception raised in sub task

huey/api.py

@@ -477,8 +477,13 @@ def build_error_result(self, task, exception):
         except AttributeError:  # Seems to only happen on 3.4.
             tb = '- unable to resolve traceback on Python 3.4 -'
 
+        if isinstance(exception, TaskException):
+            error = exception.metadata.get('error') or repr(exception)
+        else:
+            error = repr(exception)
+
         return {
-            'error': repr(exception),
+            'error': error,
             'retries': task.retries,
             'traceback': tb,
             'task_id': task.id,

huey/tests/test_api.py

@@ -578,7 +578,7 @@ def task_o(a):
         r = task_o(1)
         self.assertTrue(self.execute_next() is None)
         exc = self.trap_exception(r)
-        self.assertEqual(exc.metadata['error'], 'TaskException()')
+        self.assertEqual(exc.metadata['error'], 'TestError(1)')
 
     def test_retry(self):
         @self.huey.task(retries=1)