How to force mutation sync with React Query

When using the React Query library for data fetching and cache management, the useMutation hook is used to handle data changes (such as adding, modifying, and deleting). In certain cases, we need to ensure that the mutation state is synchronously monitored and handled by components or the application. This typically involves two aspects: state feedback and synchronization with other queries.

1. State Feedback

The useMutation from React Query returns an object containing various state information and control functions, such as isLoading, isError, error, data, etc. These can be directly used in components to provide user feedback.

For example, if you are submitting a form:

javascript
const mutation = useMutation(postNewData, {
    onSuccess: () => {
        // Handle success situation
        queryClient.invalidateQueries('data')
    },
    onError: (error) => {
        // Handle error situation
    },
});

return (
    <div>
        {mutation.isLoading ? (
            <div>Loading...</div>
        ) : (
            <> 
                {mutation.isError ? (
                    <div>Error: {mutation.error.message}</div>
                ) : (
                    <div>Data submitted successfully!</div>
                )}

                <button onClick={() => mutation.mutate({ id: 1, name: 'New Data' })}>
                    Submit Data
                </button>
            </>
        )}
    </div>
);

2. Synchronization with Other Queries

When you execute a mutation, you typically want to synchronize with other queries that depend on the same data. React Query provides several ways to achieve this:

• invalidateQueries: The most common method is to call invalidateQueries after the mutation succeeds, which causes queries dependent on a specific key to re-fetch the latest data.
• refetchQueries: Another option is to use refetchQueries, which allows you to trigger a re-fetch of one or more queries immediately after the mutation succeeds.
• setQueriesData: If you know what the new data is, you can directly use setQueriesData to update the data in the cache, avoiding additional network requests.

For example, suppose you want to immediately update the list display after adding new data:

javascript
const mutation = useMutation(addNewItem, {
    onSuccess: () => {
        queryClient.invalidateQueries('items')
    },
});

function addItem(item) {
    mutation.mutate(item);
}

In this case, when addItem is called and the mutation succeeds, all queries dependent on the 'items' key automatically re-fetch, ensuring that the UI displays the latest data.

By using these methods, React Query not only simplifies state management but also ensures data consistency and real-time updates, which is crucial for building modern, responsive web applications.