rails 3 with oracle

Hi all can you please guide me on how to setup a new rails3 application with oracle as the database. i have tried so many times and havin errors.. I used this command

rails new <app name> --database oracle

it does create the application fine but in the database.yml file i have something like this

development:   adapter: oracle   database: databaseName   username: User   password: Secret

in the gemfile i can only use gem 'activerecord-oracle_enhanced-adapter', '~>1.3.0' and i think if am to use that gem i have to get the adapter to be

development:   adapter: oracle_enhanced   database: databaseName   username: User   password: Secret

Please can someone help me with this because if i change it manually it gives me an error saying wrong adapter.. Thank you Regards, bsanneh