A simple solution for the multi-model form problem using the latest accepts_nested_attributes_for available in Rails 2.3. This version uses unobtrusive JavaScript with jQuery and HTML 5.
Once you clone this repository, just run the migrations and start up the server to try it out.
rake db:migrate script/server
See the branches for alternative solutions. Here’s how to clone a remote branch.
git checkout -b deep origin/deep
Special thanks to Tim Riley and Eloy Duran.