How to add multiple values into one key using Redis

Question

I have been trying to figure out how to get multiple values into a key for example:

{
    "fruit": {
        "tomato": {
            "Color": "red",
            "Price": "100"
        },
        "banana": {
            "Color": "yellow",
            "Price": "150"
        }
    }
}

For now my currently code is:

r = serialized_redis.MsgpackSerializedRedis(host='localhost', port=6379, db=0)
r.set("fruit", {"tomato": {"Color": "red", "Price": "100"}})
r.set("fruit", {"banana": {"Color": "yellow", "Price": "150"}})

The problem is that everytime that I do a r.set it seems that it replaces so meaning that when I run this code it will just be set of:

{
    "fruit": {
        "banana": {
            "Color": "yellow",
            "Price": "150"
        }
    }
}

so even if I do a r.set of "tomato" it will be replaced by "banana" since its the latest one that is being SET.

My question is, how can I add it to the same Key but with different values so that everything is in the same key but it has different "furits"?

{
    "fruit": {
        "tomato": {
            "Color": "red",
            "Price": "100"
        },
        "banana": {
            "Color": "yellow",
            "Price": "150"
        }
    }
}

This might help (even though it does not use py-redis): stackoverflow.com/questions/20271372/redis-list-of-nested-keys — Timbolt
– Timbolt, Commented Aug 27, 2020 at 19:16
You can also always just store for example your dictionary as a JSON string instead. — Timbolt
– Timbolt, Commented Aug 27, 2020 at 19:18
@Timbolt yes but if I just want to be able to add one value etc as I show in example th en I might not be able to do it if I use set? - I did have hard time to understand the link you showed :( — PythonNewbie
– PythonNewbie, Commented Aug 27, 2020 at 19:23
Correct, you would need to read in the JSON to a dict, modify the dict and insert the entire JSON again. Probably not a great solution here, but still good to know since it can come in very handy to use this method in other situations. — Timbolt
– Timbolt, Commented Aug 28, 2020 at 9:00

Tuan Anh Tran · Accepted Answer · 2020-08-28 07:28:13Z

2

you can use hash for that

hmset fruit tomato your_json_serialized_here
hmset fruit orange ...

you can do hmset with multiple fruit too like this hmset fruit apple 1 banana 2 orange 3

accessing data from hash with hmget is like this hmget fruit orange banana apple

answered Aug 28, 2020 at 7:28

Tuan Anh Tran

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3 Comments

PythonNewbie Over a year ago

Im not sure how that would work? I tried to do r.hmset("fruit", {"tomato": {"Color": "red", "Price": "100"}}) but that returned WRONGTYPE Operation against a key holding the wrong kind of value What am I missing?

Tuan Anh Tran Over a year ago

you have to serialize the object or stringify it hmset fruit tomato <the-json-stringify-of-object"

luisgc93 Over a year ago

Just a heads up that HMSET is deprecated as of version 4.0.0. HSET can be used instead: redis.io/commands/hset

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