How to make DRF use url path as empty and base path?

I am trying to omit the URL path for an action in a ViewSet like

@action(detail=False, methods=['patch'], url_path='')
def update_current_user(self, request):

But when I give url_path as an empty string, DRF defaults to the function name and looks for the route at /api/current-user/update_current_user. I want it to look at /api/current-user.

How to drop the whole path for the function and use the base path?

This is an instance of a so called "Singleton Endpoint" pattern, where there is only a single instance of the resource is present - no lists. This is implemented by giving an empty base path for the resource and handling the resource path in the ViewSet.

router.register(r"", CurrentUserViewSet, basename="current-user")

class CurrentUserViewSet(viewsets.ViewSet):
    ...
    @action(detail=False, methods=["patch"], url_path="current-user", url_name="current-user")
    def current_user(self, request):
        ...
        if request.method == 'GET':
            ...
        elif request.method == 'PATCH':
            ...
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