runQuery.js

import Relay from 'react-relay';

export default function runQuery(
  queryNode,
  args,
  environment,
  forceFetch = false,
) {
  const query = Relay.createQuery(queryNode, args);

  return new Promise((resolve, reject) => {
    function callback({ done, error }) {
      if (error) {
        reject(error);
        return;
      }

      if (done) {
        const [result] = environment.readQuery(query);
        resolve(result);
      }
    }

    if (forceFetch) {
      environment.forceFetch({ query }, callback);
    } else {
      environment.primeCache({ query }, callback);
    }
  });
}