How to store array of objects in Redis?

Question

I have an array of Objects that I want to store in Redis. I can break up the array part and store them as objects but I am not getting how I can get somethings like

{0} : {"foo" :"bar", "qux" : "doe"}, {1} : {"name" "Saras", "age" : 23} 

and then search the db based on name and get the requested key back. I need something like this. but can't come close to getting it right.

incr id //correct
(integer) 3
get id //correct
"3"
SADD id {"name" : "Saras"} //wrong 
SADD myset {"name" : "Saras"} //correct
(integer) 1

First is getting this part right.

Second is somehow getting the key from the value i.e.

if name==="Saras"  
then key=1

Which I find tough. Or I can store it directly as array of objects and use a simple for loop.

 for (var i = 0; i < userCache.users.length; i++) {
            if (userCache.users[i].userId == userId && userCache.users[i].deviceId == deviceId) {
                return i;
            }
        }

Kindly suggest which route is best with some implementation?

Answer 1

The thing I found working was storing the key as a unique identifier and stringifying the whole object while storing the data and applying JSON.parse while extracting it.

Example code:

client
    .setAsync(obj.deviceId.toString(), JSON.stringify(obj))
    .then((doc) => {
        return client.getAsync(obj.deviceId.toString());
    })
    .then((doc) => {
        return JSON.parse(doc);
    }).catch((err) => {
        return err;
    });

Though stringifying and then parsing it back is a computationally heavy operation and will block the Node.js server if the size of JSON becomes large. I am probably ready to take a hit for lesser complexity because I know my JSON wouldn't be huge, but that needs to be kept in mind while going for this approach.