Problem

Looking at the swagger doc gives warnings in the backend

Example:
Warning [UpvoteViewSet]: could not derive type of path parameter "id" because it is untyped and obtaining queryset from the viewset failed. Consider adding a type to the path (e.g. <int:id>) or annotating the parameter type with @extend_schema. Defaulting to "string".

Solution

possible solution: Stack Overflow suggestion
documentation