react-redux-deep-reducer
Easily create deep parameterized reducers.
Installation
npm install --save react-redux-deep-reducer
Premise
Working with react/redux, things can get complicated when building applications with state dependent on configurable properties.
For example, if you're building an analytics dashboard, you may have components that display metrics based on 1) which app the user has selected and 2) a date range filter.
You might have a reducer like:
const initialState = dailyViewsByAppIdAndDateKey: 'myApp123': '2016-02-13': /* daily views data */ '2016-02-14': /* daily views data */ 'myApp124': /* other app's metrics */ ; // Even if you used `immutable` to avoid this in the reducer, you'd have something// of similar nature in your `connect` selector function. { if actiontype === 'FETCH_DAILY_VIEWS.SUCCESS' return ...state dailyViewsByAppIdAndDateKey: ...statedailyViewsByAppIdAndDateKey actionappId: ...statedailyViewsByAppIdAndDateKeyactionappId actiondateKey: ...statedailyViewsByAppIdAndDateKeyactionappIdactiondateKey actiondailyViews ; return state;}
Using react-redux-deep-reducer
is similar to redux-form
. You configure and use a deepReducer
:
// app/reducers/index.js;;; // ... other top-level reducers, deepReducer: ;
// app/reducers/dailyViews.jsconst initialState = dailyViews: null error: null; { if actiontype === 'FETCH_DAILY_VIEWS.SUCCESS' return ...initialState dailyViews: actiondailyViews ; if actiontype === 'FETCH_DAILY_VIEWS.ERROR' return ...state error: actionerror ; return state;}
// app/components/DailyViews/index.js (connected component);; // "dumb" component // based on its props, this component should use the deep state at the path [appId, dateKey]const getInstanceKey = ownPropsappId ownPropsdateKey; const deepMapStateToProps = dailyViews: deepStateDailyViews; const deepMapDispatchToProps = ; domainKey: 'dailyViews' getInstanceKey deepMapStateToProps deepMapDispatchToPropsDailyViews;