Question

I am using redis + nowjs.
I would like to know how to go about handling a result from an hgetall()?
When I try to display the “result” in the client side, I only get [object Object] (it is probably a string from the server-side js).

//Redis result is

redis> HSET cards:lightning-bolt name "Lightning Bolt"
(integer) 1
redis> HSET cards:lightning-bolt text "Blah blah blah"
(integer) 1
redis> HGETALL cards:lightning-bolt
1) "name"
2) "Lightning Bolt"
3) "text"
4) "Blah blah blah"
redis>

//In my server js

everyone.now.signalShowRedisCard = function(card_id) {
    var self = this;
    client.hgetall(("cards:%s" % card_id), function (err, res) {
        nowjs.getGroup(self.now.room).now.receiveShowRedisCard(res);
    });
}

//In my client js (the alert just outputs [object Object])

now.receiveShowRedisCard = function(card_data) {
    alert("redis card: "+card_data);
    try {
      console.log('card data: '+ card_data);
    } catch(e) {
      console.log("Firebug not installed.");
    }
}

Any ideas? Any reply is appreciated.

Answer 1

From node_redis readme:

client.hgetall(hash)

The reply from an HGETALL command will be converted into a JavaScript
Object by node_redis. That way you can interact with the responses
using JavaScript syntax.

I don’t know how exactly is nowjs handling passing JavaScript objects, but you can try to JSON.stringify the res returned from the hgetall on the server side and then see if you get JSON string on the client. If yes then just parse it back to JavaScript object in order to work with it on the client side.