Book Image

State Management with React Query

By : Daniel Afonso
Book Image

State Management with React Query

By: Daniel Afonso

Overview of this book

State management, a crucial aspect of the React ecosystem, has gained significant attention in recent times. While React offers various libraries and tools to handle state, each with different approaches and perspectives, one thing is clear: state management solutions for handling client state are not optimized for dealing with server state. React Query was created to address this issue of managing your server state, and this guide will equip you with the knowledge and skills needed to effectively use React Query for state management. Starting with a brief history of state management in the React ecosystem, you’ll find out what prompted the split from a global state to client and server state and thus understand the need for React Query. As you progress through the chapters, you'll see how React Query enables you to perform server state tasks such as fetching, caching, updating, and synchronizing your data with the server. But that’s not all; once you’ve mastered React Query, you’ll be able to apply this knowledge to handle server state with server-side rendering frameworks as well. You’ll also work with patterns to test your code by leveraging the testing library and Mock Service Worker. By the end of this book, you'll have gained a new perspective of state and be able to leverage React Query to overcome the obstacles associated with server state.
Table of Contents (14 chapters)
Part 1: Understanding State and Getting to Know React Query
Part 2: Managing Server State with React Query

What is useMutation and how does it work?

You must be aware by now that mutations allow you to perform updates to your server state. These updates can be things such as creating data, removing data, or editing your data.

To allow you to perform mutations on your server data, React Query created a hook called useMutation.

Now, unlike useQuery, which under the default circumstances runs your query automatically as soon as the component using it renders or some dependencies of it change, useMutation will only run your mutation when you call one of the functions it returns from the hook instantiation called mutate.

To use the useMutation hook, you have to import it like this:

import { useMutation } from '@tanstack/react-query';

Once it is imported, you can use it to define your mutation. Here is the useMutation syntax:

const mutation = useMutation({
    mutationFn: <InsertMutationFunction>

As you can see from the preceding snippet...