votes up 2

mapper option expects string key or list of attributes

Package:
Exception Class:
sa_exc.ArgumentError

Raise code

    entities, prop, token._parententity, raiseerr
            )
        elif self.is_class_strategy and _is_mapped_class(token):
            entity = inspect(token)
            if entity not in entities:
                entity = None
        else:
            raise sa_exc.ArgumentError(
                "mapper option expects " "string key or list of attributes"
            )

        if not entity:
            return

        path_element = entity

        # t
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