Web Developers : 12-Set Up a New Shop Using Apollo Client's useMutation

Screenshot from the tutorial

Setting Up a New Shop Using Apollo Client's useMutation

As web developers, we often need to interact with APIs to perform CRUD (Create, Read, Update, Delete) operations. One of the most powerful tools for managing GraphQL operations in React applications is Apollo Client. In this tutorial, we’ll explore how to set up a new shop using Apollo Client’s useMutation hook. By the end, you'll have a solid understanding of how to implement mutations in your React applications.

What is Apollo Client?

Apollo Client is a comprehensive state management library for JavaScript that enables you to manage both local and remote data with GraphQL. It simplifies the process of interacting with a GraphQL API and provides powerful features like caching, optimistic UI updates, and built-in support for pagination.

Prerequisites

Before we dive into the tutorial, ensure you have the following prerequisites:

• Basic knowledge of React
• Familiarity with GraphQL concepts
• A React application set up (you can create one using Create React App)
• Apollo Client installed in your project

To install Apollo Client, run the following command:

npm install @apollo/client graphql

Setting Up Apollo Client

To begin, we need to set up Apollo Client in our React application. Create a new file named ApolloProvider.js and add the following code:

import React from 'react';
import { ApolloClient, InMemoryCache, ApolloProvider } from '@apollo/client';

const client = new ApolloClient({
  uri: 'YOUR_GRAPHQL_API_URL',
  cache: new InMemoryCache(),
});

const ApolloProviderComponent = ({ children }) => {
  return <ApolloProvider client={client}>{children}</ApolloProvider>;
};

export default ApolloProviderComponent;

Make sure to replace YOUR_GRAPHQL_API_URL with the actual URL of your GraphQL server.

Next, wrap your application with the ApolloProviderComponent in the index.js file:

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import ApolloProviderComponent from './ApolloProvider';

ReactDOM.render(
  <ApolloProviderComponent>
    <App />
  </ApolloProviderComponent>,
  document.getElementById('root')
);

Implementing useMutation

Step 1: Defining the GraphQL Mutation

To create a new shop, we need to define a GraphQL mutation. In a new file called mutations.js, add the following code:

import { gql } from '@apollo/client';

export const CREATE_SHOP = gql`
  mutation CreateShop($name: String!, $location: String!) {
    createShop(name: $name, location: $location) {
      id
      name
      location
    }
  }
`;

Step 2: Using useMutation in a Component

Now, let’s create a component where users can input shop details and trigger the mutation. Create a new file called CreateShop.js and implement the following:

import React, { useState } from 'react';
import { useMutation } from '@apollo/client';
import { CREATE_SHOP } from './mutations';

const CreateShop = () => {
  const [name, setName] = useState('');
  const [location, setLocation] = useState('');
  const [createShop, { loading, error }] = useMutation(CREATE_SHOP);

  const handleSubmit = async (e) => {
    e.preventDefault();
    try {
      const { data } = await createShop({ variables: { name, location } });
      console.log('Shop created:', data.createShop);
    } catch (err) {
      console.error('Error creating shop:', err);
    }
  };

  return (
    <form onSubmit={handleSubmit}>
      <div>
        <label htmlFor="name">Shop Name:</label>
        <input
          id="name"
          type="text"
          value={name}
          onChange={(e) => setName(e.target.value)}
          required
        />
      </div>
      <div>
        <label htmlFor="location">Shop Location:</label>
        <input
          id="location"
          type="text"
          value={location}
          onChange={(e) => setLocation(e.target.value)}
          required
        />
      </div>
      <button type="submit" disabled={loading}>
        {loading ? 'Creating...' : 'Create Shop'}
      </button>
      {error && <p>Error creating shop: {error.message}</p>}
    </form>
  );
};

export default CreateShop;

Step 3: Integrating the Component

Finally, integrate the CreateShop component into your main App.js file:

import React from 'react';
import CreateShop from './CreateShop';

const App = () => {
  return (
    <div>
      <h1>Create a New Shop</h1>
      <CreateShop />
    </div>
  );
};

export default App;

Conclusion

Congratulations! You've successfully set up a new shop using Apollo Client's useMutation hook. You learned how to define a GraphQL mutation, create a form to collect user input, and handle the mutation within your React component.

Apollo Client makes it easier to work with GraphQL APIs, and the useMutation hook is a vital tool for any developer working with mutations in React applications.

Feel free to explore further by adding features like error handling, loading states, and optimistic UI updates. Happy coding!

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