Mastering React Native by 2017

Author:2017
Language: eng
Format: mobi, epub
Publisher: Packt Publishing

The previous diagram illustrates how the Redux-promise middleware works. Actions are dispatched from our action creators. All actions are then passed through any middleware we have installed. Once the action reaches the Redux-promise middleware, it will inspect its payload property to see if it's a promise. If it's not, it will just forward the action along to the next middleware, and then ultimately out to the reducers. If the payload property is a promise, Redux-promise stops the action from moving forward and instead waits for the promise to resolve. If the promise resolves successfully, Redux-promise will take the original action and replace the old promise payload with the actual data returned from the promise. Then it simply re-dispatches the updated action. The action will flow through the middleware chain again. However, when the action hits the Redux-promise middleware this time, the payload is no longer a promise, and thus simply passes through the middleware and off to the reducers.

Now all that's left is to make our store aware of the Redux-promise middleware. In createStore.js, add the following import statement:

import promiseMiddleware from 'redux-promise';

Then, update the applyMiddleware call, adding promiseMiddleware as a parameter, as shown in the following code snippet:

export default (initialState = {}) => ( createStore( combineReducers({ news: newsFeedReducer, searchTerm: searchTermReducer }), initialState, applyMiddleware(logger, promiseMiddleware) ) );

Now, if you refresh your app one more time, you'll see live data from the NYT API that is fully searchable!

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