Default build_error() allows any serializable object as message

Author: ElSaico

Diff for: restless/resources.py

@@ -208,7 +208,7 @@ def build_error(self, err):
         :returns: A response object
         """
         data = {
-            'error': six.text_type(err),
+            'error': err.message,
         }
 
         if self.is_debug():

Diff for: tests/test_dj.py

@@ -80,7 +80,10 @@ def update(self, pk):
                     return
 
     def create_detail(self):
-        raise ValueError("This is a random & crazy exception.")
+        raise ValueError({
+            'code': 'random-crazy',
+            'message': 'This is a random & crazy exception.',
+        })
 
     @skip_prepare
     def schema(self):
@@ -252,7 +255,10 @@ def test_handle_build_err(self):
         self.assertEqual(resp['Content-Type'], 'application/json')
         self.assertEqual(resp.status_code, 500)
         self.assertEqual(json.loads(resp.content.decode('utf-8')), {
-            'error': 'This is a random & crazy exception.'
+            'error': {
+                'code': 'random-crazy',
+                'message': 'This is a random & crazy exception.',
+            }
         })
 
     def test_object_does_not_exist(self):