How to Fix GraphiQL 404 Errors in Rails 6 API Mode

Описание: Learn how to resolve the `404 Not Found` error when accessing GraphiQL in Rails 6 API mode with simple steps and explanations.
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This video is based on the question https://stackoverflow.com/q/62798355/ asked by the user 'Josh Wren' ( https://stackoverflow.com/u/12125984/ ) and on the answer https://stackoverflow.com/a/62805255/ provided by the user 'Josh Wren' ( https://stackoverflow.com/u/12125984/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving 404 Errors in Rails 6 API Mode GraphiQL

If you’ve been working on a Rails 6 application in API mode and are currently implementing GraphQL, you might have encountered a frustrating error when trying to access the GraphiQL interface. Specifically, you might see a 404 Not Found response. This problem can be perplexing, especially when queries work perfectly in tools like Postman. In this guide, we will explore the root cause of this issue and how to effectively resolve it.

Understanding the Issue

You set up your Rails application and added GraphQL functionality, but upon visiting the GraphiQL interface (at http://localhost:5000/api/v2/graphiql/), you are confronted with errors that look something like this:

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This response indicates that the application cannot find the GraphqlController that is required to handle the requests made through GraphiQL.

Fixing the GraphiQL 404 Error

Step 1: Check Your Routes Configuration

The first step in resolving this issue is to take a closer look at your routes configuration. In your routes.rb file, you have the following configuration under the v2 namespace:

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Step 2: Correct the graphql_path

The key issue in your configuration is the graphql_path. Currently, it’s set to "/graphql", which does not match the actual path your Rails API is serving. You need to update this line to reflect the correct nested path, which in your case would be "/api/v2/graphql/".

Make the following modification:

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Step 3: Ensuring Proper Namespacing

After making the above adjustment, ensure that your GraphqlController is correctly defined within the Api::V2 namespace. Here’s a quick example of what it should look like:

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Make sure the controller is named and nested correctly, as this is crucial for the routing to function properly.

Conclusion

By making these simple adjustments to your routes and ensuring that your GraphQL controller is organized correctly, you should be able to eliminate the 404 errors when accessing the GraphiQL interface. Now, you can enjoy a seamless experience while developing with GraphQL in your Rails 6 application.

Implement these changes, and you’ll be well on your way to efficiently building your API with GraphQL. Happy coding!