Relevanssi can index attachment contents from files linked to posts with ACF File fields. This does not happen automatically but requires some extra code.
The code required depends on which return value you use for your ACF File fields. If you use “File ID”, the code looks like this:
add_filter( 'relevanssi_content_to_index', 'rlv_get_acf_file', 10, 2 );
add_filter( 'relevanssi_excerpt_content', 'rlv_get_acf_file', 10, 2 );
function rlv_get_acf_file( $content, $_post ) {
$file = get_field( 'pdf_file', $_post->ID );
if ( ! empty( $file ) ) {
$content .= ' ' . get_post_meta( $file, '_relevanssi_pdf_content', true );
}
return $content;
}For “File Array”, the code looks like this:
add_filter( 'relevanssi_content_to_index', 'rlv_get_acf_file', 10, 2 );
add_filter( 'relevanssi_excerpt_content', 'rlv_get_acf_file', 10, 2 );
function rlv_get_acf_file( $content, $_post ) {
$file = get_field( 'pdf_file', $_post->ID );
if ( is_array( $file ) && isset( $file['ID'] ) ) {
$content .= ' ' . get_post_meta( $file['ID'], '_relevanssi_pdf_content', true );
}
return $content;
}“File URL” is the most complex case, and as it requires extra database queries, I would strongly recommend against using it. The code looks like this:
add_filter( 'relevanssi_content_to_index', 'rlv_get_acf_file', 10, 2 );
add_filter( 'relevanssi_excerpt_content', 'rlv_get_acf_file', 10, 2 );
function rlv_get_acf_file( $content, $_post ) {
$file = get_field( 'pdf_file', $_post->ID );
if ( ! empty( $file ) ) {
$upload_dir = wp_upload_dir();
$file = str_replace( $upload_dir['baseurl'] . '/', '', $file );
global $wpdb;
$file_id = $wpdb->get_var(
$wpdb->prepare(
"SELECT post_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attached_file' AND meta_value = %s",
$file
)
);
$content .= ' ' . get_post_meta( $file_id, '_relevanssi_pdf_content', true );
}
return $content;
}Add the code to your site and rebuild the index. If you have read the attachment contents, Relevanssi will now include it in the posts to which the files are linked. Relevanssi will also use the attachment content for building excerpts.
Super helpful! ACF file fields should be stored as IDs regardless of the return format. The first snippet can be used in all cases with the addition of turning off formatting (the third parameter in ‘get_field’): $file = get_field( ‘pdf_file’, $_post->ID, false );