How to use the React-Query library for optimistic updates with automatic retries



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To use the React-Query library for optimistic updates with automatic retries, you can utilize the useMutation hook along with the optimisticUpdate and retry options. Here's how you can achieve this:

  1. Install React-Query: If you haven't already, install React-Query in your project.
bash
npm install react-query
  1. Define Your Mutation Function: Define your mutation function that performs the optimistic update and triggers the actual mutation.
javascript
import { useMutation } from 'react-query';

const updateUser = async (userData) => {
  // Perform the optimistic update immediately
  optimisticUpdate(userData);

  try {
    // Simulate a network request with a delay
    await new Promise((resolve) => setTimeout(resolve, 1000));

    // Perform the actual mutation
    const response = await fetch('/api/updateUser', {
      method: 'PUT',
      body: JSON.stringify(userData),
      headers: {
        'Content-Type': 'application/json',
      },
    });

    if (!response.ok) {
      throw new Error('Network response was not ok');
    }

    return await response.json();
  } catch (error) {
    // Rollback the optimistic update if an error occurs
    rollbackOptimisticUpdate(userData);
    throw error;
  }
};

In this example:

  • updateUser is a function that performs an optimistic update immediately and triggers the actual mutation.
  • If the network request succeeds, the optimistic update is kept. If it fails, the optimistic update is rolled back.
  1. Use the useMutation Hook: Use the useMutation hook to define the mutation in your component.
javascript
const { mutate, isLoading } = useMutation(updateUser, {
  retry: 3, // Retry the mutation up to 3 times before throwing an error
});

const handleUpdateUser = (userData) => {
  mutate(userData);
};

In this example:

  • We use the useMutation hook to define the mutation, passing the updateUser function as the first argument.
  • We specify the retry option to retry the mutation up to 3 times before throwing an error.
  1. Call the Mutation Function: Call the mutation function in your component when you want to perform the mutation.
javascript
<button onClick={() => handleUpdateUser(userData)}>Update User</button>

With this setup, React-Query will automatically handle optimistic updates with retries. If the mutation fails, it will be retried according to the specified retry policy before throwing an error. This ensures a smoother user experience by handling network failures gracefully.

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