post-to-post-relations-gravity-forms

/*
 * matches the student academic profile with their school in the Gravity Form
 * it uses a modified version of the save function from the relations post type
 * plugin that is meant to work with the GF form of this specific ID
 */
add_action( 'gform_post_submission_4', 'sfn_tan_make_post_relation', 10, 2);

function sfn_tan_make_post_relation( $entry, $form, $custom_id = 0, $object_ids = array(), $post_types = array(), $append = true ) {
	global $wpdb;

    $custom_id = $entry[ "post_id" ];
    $object_ids = $entry["2"];

	// Object ID is valid ?
	$custom_id = (int) $custom_id;
	if ( $custom_id == 0 ) {
		return false;
	}

	// No append ? replace ! delete before !
	if ( $append == false ) {
		rpt_delete_object_relation( $custom_id, $post_types );
	}

	// Always an array ?
	if ( !is_array($object_ids) )
		$object_ids = array( (int) $object_ids );

	// Cast values and make unique
	$object_ids = array_map( 'intval', $object_ids );
	$object_ids = array_unique( $object_ids );

	// No valid ID ?
	if ( empty($object_ids) )
		return false;

	// Loop for insert on DB !
	foreach( (array) $object_ids as $object_id ) {
		if ( $object_id == 0 || $object_id == $custom_id ) continue; // No zero, no master/master !

		$wpdb->insert( $wpdb->posts_relations, array( 'object_id_1' => $custom_id, 'object_id_2' => $object_id ) );
	}

	return true;
}