swagger documentation for django viewset

api.py

class PlanViewset(viewsets.ModelViewSet):
 
    class Schema(AutoSchema): 
        def get_operation(self, path, method):
            op = super().get_operation(path, method)
            if method == "GET" and path.split('/')[-2] != '{id}':
                op['parameters'].append({
                    "name": "time_window_id",
                    "in": "query",
                    "required": False,
                    "description": "filters plans based on time_window_id",
                    'schema': {'type': 'int'}
                })
            return op
    schema = Schema(tags=['courier'])
    
    #... usual code below
    queryset = Plan.objects.all()
    serializer_class = PlanSerializer