rest_framework.filters.OrderingFilter doesn't try to pass context from view.get_serializer_context

[erogleva]

django-rest-framework/rest_framework/filters.py

Line 270 in 71e6c30

valid_fields = [item[0] for item in self.get_valid_fields(queryset, view, {'request': request})]

The remove_invalid_fields method of the OrderingFilter doesn't try to get the serializer context from the get_serializer_context method of the view but instead only passes the request as a context. This can lead to bugs in the case when the serializer expects additional (custom) keys in the context. Is there any specific reason not to include it? I'd be happy to open a PR if you think that it should be fixed