Gain insights into integrating Apollo Client with React to manage GraphQL data. Delve into TypeScript code generation, lazy queries, union types, and executing mutations efficiently.

apollohandbook.tar.gz

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Apollo Client is a popular library in JavaScript which is integrated with React applications to fetch and manage local and remote data with GraphQL. It is a comprehensive state management library, managing the state automatically with minimal code.

In this course, you’ll learn to integrate React applications with a GraphQL server. The course uses Apollo with React applications to query a GraphQL server. You will learn how to use the GraphQL Code Generator to generate TypeScript code that you can use in a React application to query and use GraphQL data in a standardized manner. You will learn how to generate lazy queries and use union types. By the end, you will also learn about mutations and their executions.

This course will help you gain working knowledge of data fetching, caching, and managing with the help of Apollo Client. To further your skills, you may use Apollo Client to integrate with Angular, Vue, Solid, Svelte and other JavaScript frameworks.

Integrating Apollo Client with React Applications

import {ApolloClient, InMemoryCache } from "@apollo/client";

const client = new ApolloClient({
    uri: "{{EDUCATIVE_LIVE_VM_URL}}:3000",
    cache: new InMemoryCache(),
}); 

export default client;

import React from 'react';
import { shallow, configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

configure({ adapter: new Adapter() });

import HelloWorld from './app';

var TestResult = function() {
    this.succeeded = false;
    this.reason = "";
    this.input = "";
    this.expected_output = "";
    this.actual_output = "";
}

export const executeTests = function() {

  var results = [];

  result = new TestResult();
  result.input = 'HelloWorld Component';
  result.expected_output = "span containing text 'Hello World'"

  let wrapper = shallow(<HelloWorld />);

  // Call your Challenge function here.

  let type = wrapper.type();
  let testSuccessful = true;
  let failureReason;

  if (type !== 'span') {
    testSuccessful = false;
    failureReason = "You need to render exactly one span HTML element";
  } else if (wrapper.props().children != "Hello World") {
     testSuccessful = false;
     failureReason = "You have rendered wrong message in your span element";
  }

  result.actual_output = wrapper.html();

  if (testSuccessful) {
    result.succeeded = true;
    result.reason = "Succeeded"
  } else {
    result.succeeded = false;
    result.reason = failureReason;
  }

  results.push(result);

  return results;
}


Introduction

Introducing Apollo Client

Automatically Generated Types

Lazy Queries

Union Types

Mutations

Conclusion

Appendix

Create a React Application with Apollo

Exercise: Create an application

Solution