Ruby on Rails

how can I rewrite the migration script to generate the composite keys
from an existing table

......
PRIMARY KEY (`id`),
KEY `by_scheduled_sent_released`
(`scheduled_at`,`sent_at`,`released_at`),
KEY `by_account_uidl` (`account_id`,`unique_id`),
KEY `by_account_message` (`account_id`,`message_id`),
KEY `by_released_sent_received`
(`released_at`,`sent_at`,`received_at`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

is it true that Rails doesn't support it ?

thanks fy feedback

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