Скачать или смотреть Resolving GraphQL Arguments in Extended Types

Discover how to properly access arguments in GraphQL extended types using Node.js and Apollo. This guide breaks down the steps to ensure you can retrieve your desired data effectively.
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This video is based on the question https://stackoverflow.com/q/63014519/ asked by the user 'electo' ( https://stackoverflow.com/u/5387755/ ) and on the answer https://stackoverflow.com/a/63014888/ provided by the user 'Nicholas Harder' ( https://stackoverflow.com/u/8218010/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding GraphQL: Accessing Arguments in Extended Types

Working with GraphQL can be challenging, especially when you're just getting started. If you find yourself stumbling upon issues such as not being able to access arguments passed in extended types, you're not alone! Let’s delve into a scenario and explore a clear solution.

The Problem at Hand

In our example, we have a user micro-service that contains a User type, and we're attempting to extend this type in another service for tracking user progression. The challenge arises when we need to access two specific arguments—playlistId and itemIndex—in a resolver but find ourselves facing an empty data object.

Here’s a quick overview of the relevant parts of our schema and resolver setup:

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Despite extending the User type to include Progression, our resolver for the progression is not returning the arguments as expected.

The Solution Breakdown

To address this issue effectively, we need to follow a couple of steps to correctly define the query structure and access the arguments appropriately.

Step 1: Define a Root Query

GraphQL schemas necessitate a root query type that enables you to fetch data at a base level. This is where you define how to retrieve a user. Here’s how to set it up:

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Now, you will need a corresponding resolver:

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Step 2: Modify the Progression Resolver

The second part of our solution is ensuring that we can successfully access the playlistId and itemIndex arguments within the User.progression resolver. To do this, we should modify the schema to include those arguments directly in the progression field definition:

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

Step 3: Update the Query to Include Arguments

Finally, the query that you send needs to be structured to utilize these new definitions:

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Conclusion

By following these steps, you can successfully resolve the issue of accessing arguments within your GraphQL setup. It involves defining a root query, adjusting your resolver structure, and crafting your queries appropriately. Remember, the learning curve might be steep, but with practice, you’ll get the hang of GraphQL and its powerful capabilities. Good luck, and happy coding!