Fix OpenAPI Schema yaml rendering for timedelta (#9007)

* fix OpenAPIRenderer for timedelta

* added test for rendering openapi with timedelta

* fix OpenAPIRenderer for timedelta

* added test for rendering openapi with timedelta

* Removed usage of field.choices that triggered full table load (#8950)

Removed the `{{ field.choices|yesno:",disabled" }}` block because this triggers the loading of full database table worth of objects just to determine whether the multi-select widget should be set as disabled or not.

Since this "disabled" marking feature is not present in the normal select field, then I propose to remove it also from the multi-select.

* Added Deprecation Warnings for CoreAPI (#7519)

* Added Deprecation Warnings for CoreAPI

* Bumped removal to DRF315

* Update rest_framework/__init__.py

* Update rest_framework/filters.py

* Update rest_framework/filters.py

* Update tests/schemas/test_coreapi.py

* Update rest_framework/filters.py

* Update rest_framework/filters.py

* Update tests/schemas/test_coreapi.py

* Update tests/schemas/test_coreapi.py

* Update setup.cfg

* Update rest_framework/pagination.py

---------

Co-authored-by: Asif Saif Uddin <auvipy@gmail.com>

* Update copy right timeline

* Fix NamespaceVersioning ignoring DEFAULT_VERSION on non-None namespaces (#7278)

* Fix the case where if the namespace is not None and there's no match,
  NamespaceVersioning always raises NotFound even if DEFAULT_VERSION
  is set or None is in ALLOWED_VERSIONS

* Add test cases

* fix OpenAPIRenderer for timedelta

* added test for rendering openapi with timedelta

* added testcase for rendering yaml with minvalidator for duration field (timedelta)

---------

Co-authored-by: Rizwan Shaikh <rshaikh@ces-ltd.com>
Co-authored-by: Lenno Nagel <lenno@namespace.ee>
Co-authored-by: David Smith <39445562+smithdc1@users.noreply.github.com>
Co-authored-by: Asif Saif Uddin <auvipy@gmail.com>
Co-authored-by: Konstantin Kuchkov <konstantin.kuchkov@gmail.com>

rest_framework/renderers.py

@@ -9,6 +9,7 @@ REST framework also provides an HTML renderer that renders the browsable API.
 
 import base64
 import contextlib
+import datetime
 from urllib import parse
 
 from django import forms
@@ -1062,6 +1063,7 @@ class OpenAPIRenderer(BaseRenderer):
             def ignore_aliases(self, data):
                 return True
         Dumper.add_representer(SafeString, Dumper.represent_str)
+        Dumper.add_representer(datetime.timedelta, encoders.CustomScalar.represent_timedelta)
         return yaml.dump(data, default_flow_style=False, sort_keys=False, Dumper=Dumper).encode('utf-8')
 
 

rest_framework/utils/encoders.py

@@ -65,3 +65,14 @@ class JSONEncoder(json.JSONEncoder):
         elif hasattr(obj, '__iter__'):
             return tuple(item for item in obj)
         return super().default(obj)
+
+
+class CustomScalar:
+    """
+    CustomScalar that knows how to encode timedelta that renderer
+    can understand.
+    """
+    @classmethod
+    def represent_timedelta(cls, dumper, data):
+        value = str(data.total_seconds())
+        return dumper.represent_scalar('tag:yaml.org,2002:str', value)

tests/schemas/test_openapi.py

@@ -1162,6 +1162,31 @@ class TestGenerator(TestCase):
         assert b'"openapi": "' in ret
         assert b'"default": "0.0"' in ret
 
+    def test_schema_rendering_to_yaml(self):
+        patterns = [
+            path('example/', views.ExampleGenericAPIView.as_view()),
+        ]
+        generator = SchemaGenerator(patterns=patterns)
+
+        request = create_request('/')
+        schema = generator.get_schema(request=request)
+        ret = OpenAPIRenderer().render(schema)
+        assert b"openapi: " in ret
+        assert b"default: '0.0'" in ret
+
+    def test_schema_rendering_timedelta_to_yaml_with_validator(self):
+
+        patterns = [
+            path('example/', views.ExampleValidatedAPIView.as_view()),
+        ]
+        generator = SchemaGenerator(patterns=patterns)
+
+        request = create_request('/')
+        schema = generator.get_schema(request=request)
+        ret = OpenAPIRenderer().render(schema)
+        assert b"openapi: " in ret
+        assert b"duration:\n          type: string\n          minimum: \'10.0\'\n" in ret
+
     def test_schema_with_no_paths(self):
         patterns = []
         generator = SchemaGenerator(patterns=patterns)

tests/schemas/views.py

@@ -134,6 +134,11 @@ class ExampleValidatedSerializer(serializers.Serializer):
     ip4 = serializers.IPAddressField(protocol='ipv4')
     ip6 = serializers.IPAddressField(protocol='ipv6')
     ip = serializers.IPAddressField()
+    duration = serializers.DurationField(
+        validators=(
+            MinValueValidator(timedelta(seconds=10)),
+        )
+    )
 
 
 class ExampleValidatedAPIView(generics.GenericAPIView):