Sourcing from WordPress
WordPress is a free and open-source content management system (CMS). Let’s say you have a site built with WordPress and you want to pull the existing data into your static Gatsby site. You can do that with gatsby-source-wordpress. Let’s begin!
Note: this guide uses the
gatsby-starter-default to provide you with the knowledge necessary to start working with WordPress but if you get stuck at some point of the guide feel free to use
this example to gain extra insights.
This guide assumes that you have a Gatsby project set up. If you need to set up a project, head to the Quick Start guide, then come back.
Essentially the Gatsby home base. The two things defined here initially (in the starter) are
plugins you can add to enable new functionalities on your site.
Now that you have some understanding of project structure lets add fetching WordPress data functionality. There’s a plugin for that.
gatsby-source-wordpress is Gatsby’s plugin for sourcing data from WordPress sites using the WordPress JSON REST API. You can install it by running the following command:
gatsby-config.js, add your configuration options, including your WordPress site’s baseUrl, protocol, whether it’s hosted on wordpress.com or self-hosted, and whether it makes use of the Advanced Custom Fields (ACF) plugin.
Note: If your config varies from what it shown above, for instance, if you are hosting your WordPress instance on WordPress.com, please refer to the plugin docs for more information on how to setup other options required for your use case.
Once your source plugin is pulling data, you can construct your site pages by implementing the
createPages API in
gatsby-node.js. When this is called, your data has already been fetched and is available to query with GraphQL. Gatsby uses GraphQL at build time; Your source plugin (in this case,
gatsby-source-wordpress) fetches your data, and Gatsby uses that data to ”automatically infer a GraphQL schema” that you can query against.
createPages API exposes the
The GraphQL function allows us to run arbitrary queries against the local WordPress GraphQL schema… like the site has a built-in database constructed from the fetched data that you can run queries against. (Source)
You can use the
gatsby-node.js from the plugin demo to get started. For the purpose of this guide, the code to construct posts works out of the box. It queries your local WordPress GraphQL schema for all Posts, iterates through each Post node and constructs a static page for each, based on the defined template.
For example, find an excerpt of the demo
After fetching data from WordPress via the query, all posts are iterated over, calling
createPage for each one.
A Gatsby page is defined as “a site page with a pathname, a template component, and an optional GraphQL query and Layout component.”
When you restart your server with the
gatsby develop command, you’ll be able to navigate to the new pages created for each of your posts at their respective paths.
In the GraphiQL IDE at
http://localhost:8000/__graphql you should now see queryable fields for
allWordpressPosts in the docs or explorer sidebar.
This was a very basic example meant to help you understand how you can fetch data from WordPress and use it with Gatsby. As the guide mentioned already, if you got stuck, you can have a look at example repo, which is a working example created to support this guide.