Custom Post Types

Using Custom Post Types with WPGraphQL​

In order to use Custom Post Types with WPGraphQL, you must configure the Post Type to show_in_graphql using the following fields:

• show_in_graphql (boolean): true or false
• graphql_single_name (string): camel case string with no punctuation or spaces. Needs to start with a letter (not a number). Important to be different than the plural name.
• graphql_plural_name (string): camel case string with no punctuation or spaces. Needs to start with a letter (not a number). Important to be different than the single name.

Registering a new Custom Post Type​

This is an example of registering a new “docs” post_type and enabling GraphQL Support.

add_action( 'init', function() {
   register_post_type( 'docs', [
      'show_ui' => true, # whether you want the post_type to show in the WP Admin UI. Doesn't affect WPGraphQL Schema.
      'labels'  => [
        //@see https://developer.wordpress.org/themes/functionality/internationalization/
        'menu_name' => __( 'Docs', 'your-textdomain' ), # The label for the WP Admin. Doesn't affect the WPGraphQL Schema.
      ],
      'hierarchical' => true, # set to false if you don't want parent/child relationships for the entries
      'show_in_graphql' => true, # Set to false if you want to exclude this type from the GraphQL Schema
      'graphql_single_name' => 'document', 
      'graphql_plural_name' => 'documents', # If not set, will default to `all${graphql_single_name}`, i.e. `allDocument`.
      'public' => true, # set to false if entries of the post_type should not have public URIs per entry
      'publicly_queryable' => true, # Set to false if entries should only be queryable in WPGraphQL by authenticated requests
   ] );
} );

Filtering an Existing Post Type​

If you want to expose a Post Type that you don’t control the registration for, such as a post type registered in a third-party plugin, you can filter the Post Type registration like so:

add_filter( 'register_post_type_args', function( $args, $post_type ) {

  // Change this to the post type you are adding support for
  if ( 'docs' === $post_type ) {
    $args['show_in_graphql'] = true;
    $args['graphql_single_name'] = 'document';
    $args['graphql_plural_name'] = 'documents'; # Don't set, and it will default to `all${graphql_single_name}`, i.e. `allDocument`.
  }

  return $args;

}, 10, 2 );

Using Custom Post Type UI​

Custom Post Type UI is a popular WordPress plugin that enables users to register Custom Post Types and Custom Taxonomies from the WordPress dashboard via a user interface. The WPGraphQL for Custom Post Type UI plugin provides fields to Custom Post Type UI that allow you to set whether the Post Type or Taxonomy should show in GraphQL, and set the GraphQL Single Name and GraphQL Plural Name.

Public vs Private Data​

WPGraphQL respects WordPress access control policies. If a Post Type is registered as publicly_queryable => true then WPGraphQL will expose posts of that post type to public queries. If the post type is registered as publicly_queryable => false the posts of that post type will be exposed only to authenticated users who have the capability required to access it.

Querying Custom Post Types​

Querying content in a Custom Post type is similar to querying Posts & Pages. The difference being that the graphql_single_name and graphql_plural_name will be shown in the Schema.

So, assuming you registered the post type as shown above, with the graphql_plural_name of docs, you would be able to query like so:

{
  docs {
    nodes {
      id
      title
    }
  }
}

And if your graphql_single_name were Doc, you would be able to query a single Doc like so:

{
  doc( id: "validIdGoesHere" ) {
    id
    title
  }
}

Post Type Supports & Interfaces​

All post types have the ContentNode Interface applied to their GraphQL Type.

WPGraphQL exposes fields that a post type has registered support for using the post_type_supports, and leaves out fields that a post type does not support.

Supported fields are applied to the GraphQL Type using Interfaces.

An example, would be the title field.

If your Custom Post Type supports the title field, the GraphQL Type representing your post type will have the NodeWithTitle Interface applied to it.

Mutating Custom Post Types​

Mutating Custom Post types is pretty similar to mutating Posts & Pages.