fix yaml encoder for OrderedDict objects #1158

drf_spectacular/renderers.py

@@ -1,3 +1,4 @@
+from collections import OrderedDict
 from datetime import time, timedelta
 from decimal import Decimal
 from uuid import UUID
@@ -53,6 +54,10 @@ def safestring_representer(dumper, data):
             return dumper.represent_str(data)
         Dumper.add_representer(SafeString, safestring_representer)
 
+        def ordereddict_representer(dumper, data):
+            return dumper.represent_dict(dict(data))
+        Dumper.add_representer(OrderedDict, ordereddict_representer)
+
         return yaml.dump(
             data,
             default_flow_style=False,

tests/test_regressions.py

@@ -1,3 +1,4 @@
+import collections
 import datetime
 import re
 import typing
@@ -2057,7 +2058,8 @@ class RouteNestedViewset(viewsets.ModelViewSet):
     datetime.timedelta(days=1),
     uuid.uuid4(),
     Decimal(),
-    b'deadbeef'
+    b'deadbeef',
+    collections.OrderedDict([('a', 1), ('b', 2)]),
 ])
 def test_yaml_encoder_parity(no_warnings, value):
     # make sure our YAML renderer does not choke on objects that are fine with