Indexed list in domain class

[RudyardKipling]

I have two domain model classes:
class Race {
List registrations
static hasMany = [registrations: Registration]
}

class Registration {
static belongsTo = [race: Race]
}

Grails created for me two databases:
CREATE TABLE `race` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`version` bigint(20) NOT NULL,
PRIMARY KEY (`id`)
)

CREATE TABLE `transport`.`registration` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`version` bigint(20) NOT NULL,
`race_id` bigint(20) NOT NULL,
`registrations_idx` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `FKAF83E8B958808C8F` (`race_id`)
)

I read a lot of info about GORM but didn't find how to map list to indexed column that I can provide(like @IndexedColumn in Hibernate), not automatic generated. I need to use my own index column. How it can be realized in Grails?

[filipblondeel]

Of course Grails can do this
Just take a look at this section in the Grails Reference:
http://grails.org/doc/latest/ref/Dat...dexColumn.html

[RudyardKipling]

Thanks a lot