Support to observe the relevant actions only

[lnaie]

Hi,

In current implementation, all the subscribers are notified when an action has been performed.
Any plans to support notification of the relevant subscribers only? The use-case would be: I would like to subscribe for the results of a particular action only. Or provide the dispatched action as a param in the subscription callback?

It may not be relevant to reactjs, but it will be useful to the other worlds.

Thanks

[just-boris]

As you can see in the shopping-cart example, you can the following reducer:

function addedIds(state, action) {
  switch (action.type) {
    case ADD_TO_CART:
      return handleCartUpdate(state, action);
    default:
      return state
  }

There is a lot of different actions, but you can change state only on some of them. If you get an action, which is not interesting for you, just skip it and go to default section.

Does it help for you?

[lnaie]

That is clear. is the reducer part of the flow.
The use-case being: In this particular page I would like to be notified only be the action x, it probably relates to the way subscribers are being handled, more exactly this part of dispatch():
listeners.slice().forEach(listener => listener()); return action

[just-boris]

This is the main concept of Redux. Listeners shouldn't know about recent action.
Here already was a discussion in #622

If you want to handle specific action, just rely on result of that action, not the action itself

[lnaie]

Did help. Thanks! :)