Using get_comment_meta() in notification emails

I am trying to include a custom comment meta value in a notification email.

When a visitor leaves a comment on a post they also have the option to add a 1-5 star rating. The star rating is saved using:

function save_comment_meta_data( $comment_id ) {
	if ( ( isset( $_POST['rating'] ) ) && ( $_POST['rating'] != '') ) {
		add_comment_meta( $comment_id, 'rating', absint( $_POST['rating'] ) );
	}
}
add_action( 'comment_post', 'save_comment_meta_data' );

I am then trying to use this new value in the subject line of the notification email sent to the post author:

function custom_comment_notification_subject( $subject, $comment_id ) {
        $subject = 'New ' . get_comment_meta( $comment_id, 'rating', true ) . ' star rating received';

        return $subject;
}
add_filter( 'comment_notification_subject', 'custom_comment_notification_subject', 10, 2 );

Using the get_comment_meta() call in my email subject line fails with no value returned. The rating value is successfully saved to the database, but it appears wp_mail() executes before the comment meta save action has been completed (hence the empty value). Any suggestions much appreciated.

• This topic was modified 6 years, 3 months ago by IstanbulMMV.