redux-persist.md

Usage with redux-persist

⚠️ WARNING: redux-persist is undergoing a big refactor at the moment. This doc is based on the currently stable v4.6.0. v5 might or might nor break this approach ⚠️

Using the Cookies storage adapter

You might run into a situation where you want to trigger a redirect as soon as possible in case some particular piece of state is or is not set. A possible use case could be persisting checkout state, e.g. checkoutSteps.step1Completed.

To do this, the only method I'm aware of is using good old Cookies so we already have the state available during the server rendering cycle.

// routesMap.js
// ...

const canContinueIf = (stepCompleted, dispatch, fallbackRoute) => {
  if (!stepCompleted) {
    const action = redirect({ type: fallbackRoute })
    dispatch(action)
  }

// ...

export default {
  // ...
  CHECKOUT_STEP_2: {
    path: '/checkout-step-2',
    thunk: (dispatch, getState) => {
      const { checkoutSteps } = getState()
      canContinueIf(checkoutSteps.step1Completed, dispatch, 'CHECKOUT_STEP_1')
    }
  }
  // ...
}

// server/configureStore.js
//...

const parseCookies = (cookies) => {
  const parsedCookies = {}
  Object.keys(cookies).forEach((key) => {
    const value = cookies[key]
    const decodedKey = decodeURIComponent(key)
    const keyWithoutReduxPersistPrefix = decodedKey.replace(/reduxPersist:/, '')
    if (key !== 'reduxPersistIndex') { // TODO: This could be expanded into a real black- or whitelist
      parsedCookies[keyWithoutReduxPersistPrefix] = JSON.parse(value)
    }
  })
  return parsedCookies
}

//...

export default async (req, res) => {
  // ...
  const parsedCookies = parseCookies(req.cookies)
  const preLoadedState = { ...parsedCookies } // onBeforeChange will authenticate using this
  // ...
}

// src/configureStore.js
//...

export default (history, preLoadedState) => {
  // …
  const store = createStore(rootReducer, preLoadedState, enhancers)

  if (!isServer) {
    persistStore(store, {
      blacklist: ['location', 'page'],
      storage: new CookieStorage()
    })
  }
// …
}

// server/index.js
import cookieParser from 'cookie-parser'

// ...

app.use(cookieParser())

// ...