callback_method for Vanilla import using ReplyTo plugin

callback_method.php

<?php

// Added to converter.php
private function callback_oldid( $field ) {
	if ( 0 == $field ) {
		return 0;
	} else {
		$row = $this->wpdb->get_row($this->wpdb->prepare('SELECT post_id, meta_value FROM wp_postmeta WHERE meta_key = "_bbp_post_id" AND meta_value = "%s" LIMIT 1', $field));
		if( !is_null( $row ) ) {
			return $row->post_id;
		} else {
			return 0;
		}
	}
}
	
//Added to Vanilla converter file
// Make sure it is after the mapping that creates new post
$this->field_map[] = array(
	'from_tablename'  => 'Comment',
	'from_fieldname'  => 'ParentCommentID',
	'to_type'         => 'reply',
	'to_fieldname'    => '_bbp_reply_to',
	'callback_method' => 'callback_oldid'
);