swagger-docs | Generates swagger-ui json files | REST library

I'm trying to build a geolocation API with Python and Django. I already have a ModelViewSet API endpoint to display Providers at the URL http://localhost:8000/Providers and the Provider's details at http://localhost:8000/Providers/{id}. I need to add another ModeViewSet to the endpoint /Providers/{id} so that I have an API endpoint /Providers/{id}/Polygons to display all polygons created by the provider with that id. Therefore visiting the URL http://localhost:8000/Providers/{id}/Polygons should display all polygons created by Provider with that id and subsequently the details of that polygon. How can I better create the url routers or the API ModelViewSet. Thanks in advance. The code I have keeps telling me this.