RelayJS:如何通过props设置initialVariables

以下是完整的源代码(以及指向工作示例的链接):

class Echo extends React.Component {
  componentDidMount() {
    let {relay, defaultMessage} = this.props; 

    relay.setVariables({
      message: defaultMessage
    });
  }

  render() {
    let name = '';
    if (this.props.echo) {
      name = this.props.echo.name;
    }

    return (
      
Message: {name}
    );
  }
}
Echo = Relay.createContainer(Echo, {
  initialVariables: {
    message: ""
  },
  fragments: {
    echo: () => Relay.QL`
      fragment on Echo {
        name(message: $message)
      }
    `,
  },
});

class EchoApp extends React.Component {
  render() {
    return 

      
    
;
  }
}
EchoApp = Relay.createContainer(EchoApp, {
  fragments: {
    viewer: () => Relay.QL`
      fragment on Viewer {
        echo { ${Echo.getFragment('echo')} },
      }
    `,
  },
});

class EchoRoute extends Relay.Route {
  static routeName = 'Home';
  static queries = {
    viewer: (Component) => Relay.QL`
      query {
        viewer { ${Component.getFragment('viewer')} },
      }
    `,
  };
}

ReactDOM.render(
  ,
  mountNode
);