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$ rails -d mysql test
$ cd test
$ script/generate scaffold element name:string type:string
$ rake db:create && rake db:migrate
$ echo "class Directory < Element; end" >> app/models/directory.rb
$ script/console

test $ script/console
Loading development environment (Rails 2.3.2)
e = Element.ne>> e = Element.new
=> #<Element id: nil, name: nil, type: nil, created_at: nil, updated_at: nil>
>> d = Directory.new
=> #<Directory id: nil, name: nil, type: "Directory", created_at: nil, updated_at: nil>