Adding an ORM to an existing padrino application - ruby

I'm new to ruby, sinatra and padrino,
so it might be a silly question, but:
Is there a way to add an orm to an existing application ?
My problem is that I have created an application with the following command line:
$ padrino-gen project sample_blog -a mysql -b
(I thought that a default ORM was selected.)
Then tried to add a model:
$ padrino-gen model post title:string body:text
<= You need an ORM adapter for run this generator. Sorry!
How can I add the orm without recreatting the whole application?
It's not very important now, since the application do not contains anything,
but I plan latter to add tests, and I would like to know if it's easy.
Thanks for your tips for a beginner.


Open /project-name/.components with your editor and add
:orm: activerecord

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