Home/ Questions/Q 8792603
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-13T23:00:08+00:00

In Redis, to store an array of objects we should use hash for the

  • 0

In Redis, to store an array of objects we should use hash for the object and add its key to a list:

HMSET concept:unique_id name "concept"
...
LPUSH concepts concept:unique_id
...

I want to retrieve all hash values (or objects) in the list, but the list contains only hash keys so a two step command is necessary, right? This is how I’m doing in python:

def get_concepts():

    list = r.lrange("concepts", 0, -1)
    pipe = r.pipeline()

    for key in list:
         pipe.hgetall(key)
    pipe.execute()

Is it necessary to iterate and fetch each individual item? Can it be more optimized?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    You can use the SORT command to do this:

    SORT concepts BY nosort GET concept:*->name GET concept:*->some_key

    Where * will expand to each item in the list.

    Add LIMIT offset count for pagination.

    Note that you have to enumerate each field in the hash (each field you want to fetch).

    Another option is to use the new (in redis 2.6) EVAL command to execute a Lua script in the redis server, which could do what you are suggesting, but server side.

    • 0