Ruby on Rails

Kad Kerforn wrote in post #1034598:
> 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 ?

It is true that ActiveRecord does not support composite keys, not
without help. Thankfully, there is a gem for that:

https://github.com/drnic/composite_primary_keys

Note: I have not used this gem and have no opinion about it one way or
the other. It is just the first one to come up in the Github search.

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