redis: maybe write key to state?

[josephjclark]

In redis, a really common pattern is gonna be something like this

each(
  $.data,
  jGet($.data).then(state => {
    state.results.push(state.data);
    return state;
  })
);

You iterate over a set of keys, you fetch each item, you transform it and map it to state

But what if you need the key for the item you just fetched? That's been passed to get by each but then been overwritten. If the key doesn't happen to be in data, you've lost it.

The workaround is to fetch it out of references like this:

each(
  $.data,
  jGet($.data).then(state => {
    const key = state.references.at(-1).split(':')[0];
    state.results[key].push(state.data);
    return state;
  })
);

One solution would be for all redis functions to return { key, data }, much like how http returns { response, data }. That would make the key associated with data available downstream.

If there's other metadata we might want to include, perhaps we need a meta or response to be added to state instead.