Okay then you have N+1 query problem - this is data fetching problem not necessarily elixir.
You may make it faster by performing N+1 queries in parallel (use Task for instance) - but in this case you loose the benefit of Redis pipelining.
Anyway you’re accessing the data not in “Redis way”. You may prefetch most values if knows the pattern in advance - e.g. using SCAN or it’s family.
Or you can use Lua script to preprocess a little bit on redis side.
As you have redis, you may use redis for caching as well - which is helpful if transformation is expensive compared to network bandwidth between erlang nodes and redis instance.
