Why redux store should be serializable?

Question

When reading the redux doc I found that the doc mentioned this:

Still, you should do your best to keep the state serializable. Don\'t put anything

Answer 1

Adding to what @Timo said , If you want to setup relation between 2 states in your state tree and use computed values, reselect is the best suitable fit for that scenario. It allows to creareselectors which can be used to define computed states. In your case author can be created using a selector on top of book. https://github.com/reactjs/reselect