CallViewer.js

// GroupCallViewer.js
export class GroupCallViewer extends React.Component {
  render() {
    return <GroupCall groupCall={this.props.viewer.groupCall} />
  }
}

export default Relay.createContainer(GroupCallViewer, {
  initialVariables: {
    callId: "testId"
  },

  fragments: {
    viewer: () => Relay.QL`
      fragment on Viewer {
        groupCall(id:$callId) {
          ${GroupCall.getFragment('groupCall')}
        }
      }
    `,
  },
});

// AdminDashboard.js
class AdminDashboard extends React.Component {
  render() {
    return <GroupCallViewer callId="testId2" viewer={this.props.viewer}/>
  }
}

export default Relay.createContainer(AdminDashboard, {
  fragments: {
    viewer: () => Relay.QL`
      fragment on Viewer {
        ${GroupCallViewer.getFragment('viewer')}
      }
    `
  }
});