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Learn the correct way to call `GraphQL` mutations from React using hooks, ensuring smooth integration and functionality in your applications.
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Calling GraphQL Mutations from React using Hooks: A Comprehensive Guide

Working with GraphQL in React can be a powerful way to manage data in your applications. However, you may run into issues when trying to call mutations, particularly when it comes to input types. In this guide, we will explore the correct way to call GraphQL mutations from React using hooks, ensuring that you gain a clear understanding of both the problem and the solution.

Understanding the Problem

Imagine you have defined a GraphQL mutation for user signup, as shown below:

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When using this GraphQL mutation in a testing environment such as GraphQL Playground, it returns the expected response:

[[See Video to Reveal this Text or Code Snippet]]

However, things can get a bit tricky when you move to your React client. You may encounter an error like:

[[See Video to Reveal this Text or Code Snippet]]

This error means that your mutation does not receive the required input argument as defined in your GraphQL schema.

The Solution: Correctly Calling the Mutation

To correctly call this mutation from your React client, you need to ensure that you're passing the values in the expected format. Let’s break this down step-by-step.

Step 1: Define Your Mutation

First, you need to define your mutation using the Apollo Client's gql template literal:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Set Up State Variables

Next, you’ll need state variables to hold the email and password inputs:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Use the Mutation Hook

Use the useMutation hook to call the SIGNUP_MUTATION. This hook will provide you with a function to call the mutation and some metadata such as loading state and any errors:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Call the Mutation with Correct Input

When you call the mutation, remember to wrap your email and password in an object that matches the input type expected by your mutation:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By understanding the format your GraphQL mutation expects, you can call it correctly from your React client. Instead of passing email and password directly as variables, you must encapsulate them within an input object.

Now you're equipped with the knowledge to correctly implement GraphQL mutations in your React applications using hooks! Happy coding!