title: Composite Primary Keys in Rails still being ignored
body: <p>I've set up a database that has composite primary keys for Ruby on Rails. Creating the migration works, but when I start to seed the database, I still get a warning that "Active Record does not support primary keys." and that the "Composite primary key is ignored." even after I've installed the composite_primary_keys gem, and included <code>require 'composite_primary_keys'</code> into the <code>environments.rb</code> file.</p>
  
  <p>Any thoughts as to why the composite primary key is still ignored?</p>