Fixing the Syntax Error: Invalid number in Next.js GraphQL Queries

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Understanding the Problem

The error message indicates that there’s an invalid syntax in your query. Specifically, it suggests that the GraphQL query is not recognizing the slug you’re trying to pass properly. This error often happens when you are dynamically including variables without correct variable syntax in your query.

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The problem lies in how you’re interpolating the slug into your GraphQL query string.

The Solution

To resolve this issue, you need to change the way you are implementing your query. Let’s break it down step-by-step:

Step 1: Modify Your Query Function

First, you should update your getSlugQuery function to not accept any parameters. Instead of injecting the slug directly into the query, we'll pass it as a variable later. Here’s the revised code:

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By using $slug within your query, you are correctly defining it as a variable that can be utilized later.

Step 2: Update getStaticProps to Pass the Slug as a Variable

Next, you'll need to adjust your getStaticProps function to pass the slug variable to the Apollo client. Here's the corrected implementation:

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Step 3: The getStaticPaths Function

Finally, ensure your getStaticPaths function is set up correctly. For proper pre-rendering of dynamic routes, maintain your existing implementation as it effectively generates paths based on the data returned from your GraphQL query.

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This part of your code helps in fetching all post slugs dynamically and makes sure they are pre-rendered at build time.

Conclusion

If you have any further questions or face other issues, feel free to reach out!