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Simplifying State Management in React Native

Other React Query Functionalities

Discover how to implement React Query’s advanced functionalities like useMutation for data changes and cache updates to keep your app’s state synchronized without manual refetching. Explore techniques for handling fetch statuses, parallel and paginated queries, and React Native specific utilities to enhance server-state management.

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We can’t use React Query in our example app to mutate data on the server because our backend is not robust enough. In a real-life application, we would most probably use an API that accepts a POST request just as well as a GET request. In these cases, we would be able to change data with the help of React Query.

The useMutation hook

In order to do so, we are provided with another specialized hook: useMutation. Here’s what this hook would look like if we could use it for the favorited images:

Javascript (babel-node)
// Define a mutation using useMutation for posting new images
const imageListMutation = useMutation((newImage) => {
  return fetch('/john_doe/likedImages', { method: 'POST', body: newImage });
});

The preceding function is very simple. It wraps a fetch call in a React Query utility. This utility offers us a few things, such as the fact that it has the following states:

  • isIdle

  • isLoading

  • isError

  • isSuccess ...