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Learn how to utilize Next.js and WPGraphQL to create a dynamic post file structure with nested `getStaticPaths` in categories for improved routing and SEO.
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How to Make a Post File Using nested getStaticPaths in a Category with getStaticPaths?

Creating a robust and dynamic web application using Next.js and a Headless CMS like WordPress can present unique challenges, especially when dealing with nested routing. One common scenario developers encounter is the need to create dynamic post files that reside within specific categories. In this guide, we'll explore how to implement nested getStaticPaths for a category using an API, focusing on how to manage posts effectively.

The Problem

When building a Next.js application with a headless WordPress setup via the WPGraphQL plugin, you may need to create a structure like:

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

Here, each category can have multiple pages of posts. The challenge arises when you need to retrieve the currentCategorySlug, as you cannot effectively use useRouter to get route parameters within getStaticPaths. This leads to a dilemma on how to define paths based on categories accurately.

The Solution

Step 1: Retrieve Category and Posts

First, you need to fetch all categories and their corresponding posts using an API call. The following function GET_ALL_CATEGORY_AND_POSTS serves to retrieve this information:

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

Here’s a breakdown of what happens in this code:

Fetching Data: It retrieves all categories with their posts.

Mapping Over Categories: For each category, it calculates the total number of posts and determines how many pages are needed based on pagination logic (using constants PER_PAGE_FIRST and PER_PAGE_REST).

Creating Paths: For each page that a category could have, a corresponding path is generated that follows the structure /category/{slug}/page/{index}.

Step 2: Dynamic Paths for Pagination

This organization of paths allows Next.js to statically generate the required pages upfront. The array paths effectively contains all possible routes that your application might need for each category and its associated posts, ready for pre-rendering.

Step 3: Handling Fallback

The fallback: true setting ensures that if a user tries to access a route that hasn't been pre-rendered, Next.js will serve a fallback version of the page while it fetches and renders the page on the server side.

Step 4: Considerations for currentCategorySlug

One important aspect to note is that you need to be cautious with how you handle retrieving the currentCategorySlug. Since you cannot utilize useRouter in getStaticPaths, ensure that your API calls or context management is well set up to pass this slug down through your component hierarchy for optimal data handling.

Conclusion

Implementing nested getStaticPaths in a Next.js application using a headless WordPress API can initially seem complex, but once you break down the process of fetching categories and their posts, it becomes manageable. By following the steps outlined above, you can effectively create a structured routing setup that enhances both user experience and SEO.

This approach not only makes your application scalable but also ensures that your content is delivered swiftly to your users.

Feel free to reach out if you have any questions or need further clarification on any part of the implementation!