model.py

                details=state_json[u"details"],
            )
        else:
            raise ValueError("Unrecognized state {!r}".format(state_json))

        return cls(
            number=values[u"number"],
            expected_tokens=values[u"expected-tokens"],
            created=None if values[u"created"] is None else parse_datetime(values[u"created"]),
            state=state,
        )


    def to_json(self):
        return dumps(self.marshal())


    def marshal(self):
        return self.to_json_v1()


    def to_json_v1(self):
        state = self.state.to_json_v1()
        return {
            u"number": self.number,
            u"expected-tokens": self.expected_tokens,
            u"created": None if self.created is None else self.created.isoformat(),
            u"state": state,
            u"version": 1,
        }