search for: create_phone_number

I am trying to get polymorphic relations to work for my app. What I am trying to do is explained by this picture http://iroll.org/code/ I can''t figure out the code for in the controller to create a new phone_number and assign it to a person. I have tried everything I can think of. A) do my models look correct? B) what would the commands look like in the console or a controller action