var redis = require('redis');
if(process.env.NODE_ENV == 'production') {
  var r_client = redis.createClient(process.env.REDISCLOUD_URL);
} else {
  var r_client = redis.createClient();
}

function writeToRedis(tweet, screen_name){
  return new Promise((resolve, reject) => {
    r_client.hset(screen_name, 'tweet_id', tweet['id'], 'tweet_text', tweet['text'], 'avatar', tweet['user']['profile_image_url'], 'screen_name', tweet['user']['screen_name'], function (error, result) {
      if (error) {
        reject(error);
        return;
      }
      resolve(result);
    });
  });
}

(node:4) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): ReplyError: ERR wrong number of arguments for 'hset' command