Gutenberg Page Block Template field

gutenberg-wpgraphql-page-block-template.php

add_filter( 'graphql_page_fields', function( $fields ) {

	$fields['blockTemplate'] = [
		'type' => \WPGraphQL\Types::string(),
		'description' => __( 'The Block template defined for the page', 'oshpd-guten-blocks' ),
		'args' => [
			'pageTemplate' => [
				'type' => \WPGraphQL\Types::string(),
				'description' => __( 'The page template associated with the block template', 'oshpd-guten-blocks' ),
			],
		],
		'resolve' => function( \WP_Post $post, array $args, $info, $context ) {

			$page_template = ! empty( $args['pageTemplate'] ) ? $args['pageTemplate'] : get_page_template_slug( $post->ID );
			$saved_block_template = ! empty( $page_template ) ? get_post_meta( $post->ID, '_saved_block_template_' . $args['template'], true ) : null;

			if ( ! empty ( $saved_block_template ) ) {
				$template = $saved_block_template;
			} else {
				$template = oshpd_get_default_page_block_template( $page_template );
			}

			return $template;
		}
	];

	return $fields;

} );

/**
 * Returns the block template associated with a particular page template
 *
 * @param string $page_template The slug of the page template (ex: templates/page-template.php)
 * @return string The block template
 */
function oshpd_get_default_page_block_template( $page_template ) {

	$block_template = '';

	switch ( $page_template ) {
		case 'templates/home.php':
			$block_template = '
			<!-- wp:oshpd/homepage-hero /-->
			
			<!-- wp:oshpd/latest-news /-->
			
			<!-- wp:oshpd/leadership-cards /-->
			';
			break;
		case 'templates/landing-page.php':
			$block_template = '
			<!-- wp:oshpd/leadership-cards /-->
			<!-- wp:oshpd/homepage-hero /-->
			';
			break;
	}
	$filtered_template = apply_filters( 'oshpd_get_default_page_block_template', $block_template, $page_template );
	return preg_replace( "/\r|\n|\t/", "", $filtered_template );
}