Composite migrations for Composite Primary Keys
The good people at Err-the-Blog were almost satisfied with the humble offerings of Composite Primary Keys, which provide composite key support for ActiveRecords, including composite foreign keys in assocations. They’ve gone on an published the main remaining requested feature - composite migrations for your database table changes.
Errtheblog - Composite Migrations
Now, this means that if you want to use composite foreign keys because you like them you can create as many as you like and DHH can’t make it hard for you. 
- Posted in Composite Keys, Link, Ruby, Ruby on Rails
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