Best way to model users that have roles with differing attributes in Rails?

I'm a Rails noob and am hoping someone can help me wrap my head around this issue. I have an app that has a single User model using Authlogic for authentication and CanCan for authorization. There are three roles: Consumer, Business, and Admin. A user can have any number of these roles.

Businesses have additional attributes, however, and I need to model this such that I can add roles that each have potentially different attributes. Instinct tells me that I need to have a separate model to represent each role's attributes, i.e. BusinessRoleProfile, ConsumerRo开发者_开发知识库leProfile, etc and then maybe mixin a module programmatically that adds the appropriate has_one reference(s) to the profile model(s).

Is this the best way to handle the separate attributes? If so, can someone guide me through how to dynamically include those mixins based on what role the user has?

EDIT:

Did some more research, this may help you. https://github.com/thefrontiergroup/scoped_attr_accessible

Looks like you can do things like:

class User < ActiveRecord::Base

  # All attributes are accessible for the admin scope.
  attr_accessible :all, :scope => :admin

  # The default scope can only access a and b.
  attr_accessible :a, :b

  # Make both :c and :d accessible for owners and the default scope
  attr_accessible :c, :d, :scope => [:owner, :default]

  # Also, it works the same with attr_protected!
  attr_protected :n, :scope => :default

end

OLD ANSWER

Looks like it may be featured in CanCan 2.0.

https://github.com/ryanb/cancan/issues/326