Error in Rest when I try to serialize Array

If I create a rails application, create a model like this:

class Person < ActiveRecord::Base
serialize Array :course_years end

and, for example, insert a person using:
Person.create! :name => 'Mauricio', :course_years => [1992, 2008]

When I try to access this controller using RESTFul (Using ActiveResource::Base) I got the following error:

ArgumentError: expected an attributes Hash, got 1992