title: node.js redis async query
body: <p>Hope someone can assist with a (simple) async question on node-redis. I'm trying to load a set from a hash in the redis db and then use that populated set further on. Here's the code snippet :-</p>
  
  <pre><code>var redis_client = redis.createClient(REDIS_PORT, REDIS_URL); 
  
  redis_client.hgetall(target_hash,function(e,o){
  
      Object.keys(o).forEach(function(target){
  
          // get the "name" from the hash         
          redis_client.hget(o[target],"name",function(e,o){
          if (e){
                   console.log("Error occurred getting key: " + e);
                }
          else {
                   redis_client.sadd("newset",o);
               }
      });
  
  });
  
  // the following line prints nothing - why ?? 
  
  redis_client.smembers("newset",redis.print);
  </code></pre>
  
  <p>When I examine the contents of "newset" in redis it is populated as expected, but at runtime it displayed as empty. I'm sure it's an async issue - any help much appreciated !</p>