`is_patched_serializer` fails with `DictField`

Describe the bug My team has a list endpoint that returns a dictionary values that are generated by methods that aren’t serializers. We’d like to document at least that this endpoint returns a list of objects. I tried adding the following extend_schema:

    @extend_schema(
        responses=serializers.ListSerializer(child=serializers.DictField()),
    )
    def get(self, request: Request, *args: Any, **kwargs: Any) -> Response:
        data = # complex code to produce list of dicts here.
        return Response(data, status=200)

drf-spectacular raised the following exception:

Traceback (most recent call last):
  File "manage.py", line 11, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python3.7/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python3.7/site-packages/django/core/management/__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python3.7/site-packages/django/core/management/base.py", line 323, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/usr/local/lib/python3.7/site-packages/django/core/management/base.py", line 364, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python3.7/site-packages/drf_spectacular/management/commands/spectacular.py", line 50, in handle
    schema = generator.get_schema(request=None, public=True)
  File "/usr/local/lib/python3.7/site-packages/drf_spectacular/generators.py", line 230, in get_schema
    paths=self.parse(request, public),
  File "/usr/local/lib/python3.7/site-packages/drf_spectacular/generators.py", line 207, in parse
    operation = view.schema.get_operation(path, path_regex, method, self.registry)
  File "/usr/local/lib/python3.7/site-packages/drf_spectacular/utils.py", line 222, in get_operation
    return super().get_operation(path, path_regex, method, registry)
  File "/usr/local/lib/python3.7/site-packages/drf_spectacular/openapi.py", line 83, in get_operation
    operation['responses'] = self._get_response_bodies()
  File "/usr/local/lib/python3.7/site-packages/drf_spectacular/openapi.py", line 975, in _get_response_bodies
    return {'200': self._get_response_for_code(response_serializers, '200')}
  File "/usr/local/lib/python3.7/site-packages/drf_spectacular/openapi.py", line 1036, in _get_response_for_code
    paginated_name = f'Paginated{self._get_serializer_name(serializer, "response")}List'
  File "/usr/local/lib/python3.7/site-packages/drf_spectacular/openapi.py", line 1119, in _get_serializer_name
    return self._get_serializer_name(serializer.child, direction)
  File "/usr/local/lib/python3.7/site-packages/drf_spectacular/openapi.py", line 1126, in _get_serializer_name
    if is_patched_serializer(serializer, direction):
  File "/usr/local/lib/python3.7/site-packages/drf_spectacular/plumbing.py", line 101, in is_patched_serializer
    and serializer.partial
AttributeError: 'DictField' object has no attribute 'partial'

Expected behavior

Since this should be a valid serializer (test proving that is below), I’d expect the is_patched_serializer to handle a DictField.

    def test_list_serializer(self):
        from rest_framework.serializers import DictField, ListSerializer

        class MyListSerializer(ListSerializer):
            child = DictField()

        my_list = [{}, {'a': 'b'}]

        serializer = MyListSerializer(my_list)
        assert serializer.data == [{}, {'a': 'b'}]

[tfranzel]

that was a small but important detail

[tfranzel]

closing this issue for now. feel free to comment if anything is missing or not working and we will follow-up.