redux-api-middleware

Redux Api Middleware

redux-api-middleware is a library aiming to simplify and normalise API calls via special Redux actions. Galette provides a set of functions that helps its integration with our Store module.

Usage

Instead of importing the store functions directly, use the the functions from this module when you need to reduce redux-api-middleware actions, like in the following example:

import { store, ram } from "@birdiecare/galette-core";
const { functions: { updateItem }, reducers: { reduceList, reduceItems } } = store;
const { functions: { payloadResolver, createApiCallReducer } } = ram;

// Identifier resolver for users objects
const userIdentifierResolver = user => user.username;

// `users` reducer
export const users = (state, action) => {
  // ...

  if (action.type.indexOf(LOAD_USER_FOLLOWERS) === 0) {
    let username = action.meta && action.meta.username;

    state = reduceItems(state, action, {
        itemIdentifierResolver: userIdentifierResolver,
        payloadResolver,
    });

    return updateItem(state, username, reduceList(state[username], action, {
        listKeyInState: 'followers_list',
        actionPrefix: LOAD_USER_FOLLOWERS,
        itemIdentifierResolver: userIdentifierResolver,
        payloadResolver,
    }));
  }

  // ...
}

This example will reduce the list of followers for a given user. Using the payloadResolver specialised for redux-api-middleware, it will reduce each "follower" (which are users) item individually to prevent any duplication or outdated information in our Redux store and will then reduce the list of the followers stored within the followers_list property of the user in the store.

Let's illustrate this with a before/action/after example.

State Before:

users:
  alistair: { username: alistair, email: old@email.com }
  david: { username: david, email: dav@id.com }
  samuel: { username: samuel, email: samuel.roze@gmail.com }

Action

type: LOAD_USER_FOLLOWERS_RECEIVED
payload: [ { username: christelle, email: chri@elle.com }, { username: alistair, email: al@id.com } ]
meta:
  username: samuel

After

users:
  alistair: { username: alistair, email: old@email.com }
  christelle: { username: christelle, email: chri@elle.com }
  david: { username: david, email: dav@id.com }
  samuel:
    username: samuel
    email: samuel.roze@gmail.com
    followers_list:
      identifiers: [ christelle, alistair ]
      # others list properties...