cool_decorator_with_args.py

def validate_request_data(fields, model_name):
    def decorator_method(fn):
        def decorated(*args, **kwargs):
            # args[0] == GenericView Object
            error_messages = []
            for field in fields:
                if not args[0].request.data.get(field, None):
                    error_messages.append("Field '{}' is required for {}".format(field, model_name))
            return Response(
                data={
                    "message": ', '.join(error_messages)
                },
                status=status.HTTP_400_BAD_REQUEST
            )
            return fn(*args, **kwargs)
        return decorated
    return decorator_method