WP Grid Builder Add Meta Filter

default-blocks.php

// frontend -> templates -> blocks -> default-blocks.php

/**
 * Retrieve the post meta-data key value
 *
 * @since 1.0.0
 *
 * @param string $key Meta-data key.
 */
function wpgb_get_metadata( $key = '' ) {

	if ( empty( $key ) ) {
		return;
	}

	$key  = trim( $key );
	$post = wpgb_get_post();

	if ( ! isset( $post->metadata ) ) {
		return apply_filters('wp_grid_builder/card/metadata', null, $key, $post);
	}

	$acf_field = wpgb_get_acf_field( $key );

	if ( ! empty( $acf_field ) ) {
		return apply_filters('wp_grid_builder/card/metadata', $acf_field, $key, $post);
	}

	if ( ! isset( $post->metadata[ $key ] ) ) {
		return apply_filters('wp_grid_builder/card/metadata', null, $key, $post);
	}

	return apply_filters('wp_grid_builder/card/metadata', $post->metadata[ $key ], $key, $post);
}


/**
 * Retrieve block action link
 *
 * @since 1.0.1 Check ACF link field url key for metadata.
 * @since 1.0.0
 *
 * @param array $action Holds action args.
 * @return string
 */
function wpgb_get_block_link( $action = [] ) {

	if ( empty( $action['action_type'] ) ) {
		return;
	}

	if ( 'link' !== $action['action_type'] ) {
		return;
	}

	if ( empty( $action['link_url'] ) ) {
		$action['link_url'] = 'single_post';
	}

	$post = wpgb_get_post();

	switch ( $action['link_url'] ) {
		case 'metadata':
			$link = isset( $action['meta_key'] ) ? wpgb_get_metadata( $action['meta_key'] ) : '';
			$link = ! empty( $link['url'] ) ? $link['url'] : $link; // If ACF link field (url key).
			return apply_filters('wp_grid_builder/card/link', is_string( $link ) ? $link : '', $action, $post);
			break;
		case 'custom_url':
			return apply_filters('wp_grid_builder/card/link', isset( $action['custom_url'] ) ? $action['custom_url'] : '', $action, $post);
			break;
		case 'author_page':
			return apply_filters('wp_grid_builder/card/link', wpgb_get_author_posts_url(), $action, $post);
			break;
		default:
			return apply_filters('wp_grid_builder/card/link', wpgb_get_the_permalink(), $action, $post);
			break;
	}

}