LICENSE Rakefile TODO lib/associations.rb lib/dm-polymorphic.rb lib/tester.rb lib/types.rb spec/dm-polymorphic_spec.rb spec/spec.opts spec/spec_helper.rb @@ -1,3 +1,51 @@ -Initial repo for developing dm-polymorphic. This is not a permanent repo so please don't fork. If you want access ping me. - Please see wiki for discussion. + +The DM polymorphic gem mimics AR style polymorphism. It has been decided that DM will not follow this path, since it +really isn't very nice on the DB and there are other ways, that do not require DBA to cry to achieve the same result. + +That being said this is still useful for those ppl wishing to convert rails apps over. + +One Massive Caveat is that using this you will get n+1 calls to the db atm if you do Comments#commentable for example. It needs a proxy object if anyone cares to write one. + +This is highly experimental software, use it at your own risk. + +==== Example Usage. + +class Comment + include DataMapper::Resource + + is :polymorphic, :commentable + + property :id, Integer, :serial => true + property :text, String +end + +class Post + include DataMapper::Resource + + property :id, Integer, :serial => true + property :name, String + + has n, :comments, :via => :commentable +end + +class Article + include DataMapper::Resource + + property :id, Integer, :serial => true + property :name, String + + has n, :comments, :via => :commentable +end + +This will then provide the following methods + +Comment#commentable +Comment#post +Comment#article +Post#comments +Article#comments + +What is needed is a +Comment.commentables or something method so there is a nice proxy to avoid having all the loading issues. + README 972623928b1ddadcfb6941fb1abed7d3643b806b Daniel Neighman has.sox@gmail.com http://github.com/hassox/dm-polymorphic/commit/58e4ea7ed09b77c84a0694956492070efa4aec72 58e4ea7ed09b77c84a0694956492070efa4aec72 2008-06-16T00:04:05-07:00 2008-06-16T00:04:05-07:00 Initial Version. Experimental only b34154d5c7adda95480691828c939166b10ef3f3 Daniel Neighman has.sox@gmail.com