How to use custom query hooks inside useQueries in react- query

React Query is a powerful library for handling server-side state and cache management in React applications. It helps developers efficiently and elegantly manage data fetching, caching, synchronization, and updates. useQueries is a hook in React Query that enables batch parallel execution of multiple queries.

Custom query hooks (e.g., useCustomQuery) typically encapsulate useQuery or other React Query hooks to facilitate reusing query logic across different components.

Answering the Question

The approach for using custom query hooks within useQueries depends on how your custom hook is implemented. Assume you have a custom hook useCustomQuery that internally utilizes the useQuery hook. To illustrate, let's assume our useCustomQuery hook is designed for fetching user data:

javascript
import { useQuery } from 'react-query';

const useCustomQuery = (userId) => {
  return useQuery(['user', userId], () => fetchUserById(userId));
};

const fetchUserById = async (userId) => {
  const response = await fetch(`https://api.example.com/users/${userId}`);
  if (!response.ok) {
    throw new Error('Network response was not ok');
  }
  return response.json();
};

To integrate this hook with useQueries, we must adjust it since useQueries expects an array of query objects rather than direct hook invocations. We can create a function that returns the query object instead of directly using useQuery:

javascript
const getCustomQueryObject = (userId) => ({
  queryKey: ['user', userId],
  queryFn: () => fetchUserById(userId)
});

Then, you can use this function within useQueries to generate query objects:

javascript
import { useQueries } from 'react-query';

const userIds = [1, 2, 3];  // Assume this is the list of user IDs to query

const userQueries = useQueries(
  userIds.map(userId => getCustomQueryObject(userId))
);

Practical Application Example

Suppose you work in a large e-commerce platform and need to display multiple user profiles simultaneously in an admin interface. Using useQueries with the aforementioned custom query function makes your code clearer, easier to maintain, and improves page responsiveness because all user data requests are issued in parallel.

Summary

By abstracting the query logic from custom hooks into a function that returns query objects, we can flexibly reuse this logic within useQueries. This approach maintains clean, maintainable code and facilitates reusing and extending query functionality across different scenarios.