I just pushed a few commits that enable composite key support for
associations. Now, all 3 default association types support composite
keys for their getters/setters/add_/remove_/remove_all_ methods, as
well as for eager loading via both eager and eager_graph.
Using the new composite key feature is pretty simple. The :key
and :primary_key options for many_to_one and one_to_many associations
and the :left_key, :left_primary_key, :right_key,
and :right_primary_key options for many_to_many associations now take
arrays of symbols in addition to a single symbol:
Artist.set_primary_key [:name, :location]
Album.set_primary_key [:artist_name, :album_name]
Track.set_primary_key [:artist_name, :album_name, :number]
Album.many_to_one :artist, :key=>[:artist_name, :artist_location]
Artist.one_to_many :albums, :key=>[:artist_name, :artist_location]
Artist.many_to_many :tracks, :left_key=>
[:artist_name, :artist_location],
:right_key=>[:artist_name, :album_name],
:right_primary_key=>[:artist_name, :album_name]
If you are currently using custom associations to handle composite
keys, try using the new native composite key support and let me know
how it works for you.
Jeremy
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