Nested form

Hello,

I've got a problem with the creation of a nested form for this situation

I've got 3 models as follow

Game -> has_many :authorships

Authorship -> belong_to :author -> belong_to :game

Author

belong_to :authorship

In my form the user can enter the author name when creating a new game. The application automatically create them if they don't exist but all is hand made. i'musing a find_or_create under the wood i would like to use the nested from feature from rails 2.3 for this form but I cannot figure how to use it to create a new author if it doesn't exist or find the corect author if it exist.

I somebody got some ideas for helping me, I appreciate much.

Thanks