Скачать или смотреть Resolving the Error: Query.Mutation defined in resolvers, but not in schema in GraphQL

Discover how to quickly troubleshoot and fix the common GraphQL error: `Query.Mutation defined in resolvers, but not in schema`. Learn to identify and correct your code issues effectively.
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This video is based on the question https://stackoverflow.com/q/70783283/ asked by the user 'Berkay' ( https://stackoverflow.com/u/17982478/ ) and on the answer https://stackoverflow.com/a/70794084/ provided by the user 'Schwesi' ( https://stackoverflow.com/u/4132369/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Debugging a Common GraphQL Error: Missing Curly Bracket

When working with GraphQL, you may encounter various errors that can be quite frustrating, especially as you're learning. One typical error is the message that states: Error: Query.Mutation defined in resolvers, but not in schema. This error usually points to a small syntax issue that, once identified, can be quickly resolved.

In this guide, we'll explore this error in detail, guiding you through the process of identifying and fixing the problem so you can get back to building your application. Let’s dive into the specifics!

Understanding the Error

At its core, the error message indicates a discrepancy between the definitions in your resolver and the schema you’ve defined for GraphQL. Essentially, the GraphQL server is trying to find a Mutation in your schema that it expects to see defined but cannot locate it.

What Are Resolvers and Schemas?

Resolvers: These are functions that resolve the data for your GraphQL API. Each resolver corresponds to a function for a specific field in your type definitions.

Schemas: This is the structure that defines the types and the operations (queries and mutations) available in your GraphQL API. It essentially sets the foundation of how clients can interact with your data.

Analyzing the Code

Here's a portion of your code illustrating the setup of typedefs and resolvers:

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

Identifying the Mistake

Upon reviewing the code, the critical point is that a closing curly bracket (}) is missing right before the Mutation definition. This small oversight leads to the GraphQL server not being able to correctly parse the resolver, thus triggering the error.

Correct Placement

You should have:

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

Final Solution

To fix the error, simply add the missing curly bracket after the Query definition:

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

Conclusion

In conclusion, even minor syntax errors can lead to significant issues in your code, especially when it comes to managing resolvers and schemas in GraphQL. Always double-check your brackets and structure to avoid such pitfalls.

With a clear understanding and quick fixes, you'll be well on your way to mastering GraphQL and Express in no time. Happy coding!