Rails and ActiveRecord users have long wanted support for legacy databases; especially tables with composite primary keys. This gem enhances ActiveRecords to allow model classes to support 2+ primary keys, using the set_primary_keys(*keys) command.
Rails is a small gem that has some dependencies on a few other useful gems: ActiveRecord, ActionPack, ActiveSupport. As Composite Keys aren't required to allow Rails to work, I doubt its necessary for Rails to auto-require Composite Keys (and thus have it download when you type "gem install rails" to upgrade).
It think in the short to medium term you'll be forced to type "gem install composite_primary_keys" manually to get updates. :)
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RE: Backport into Rails proper? [ reply ]