Dynamic Role methods for Role and User models

role.rb

class Role < ActiveRecord::Base

  ROLES = [ :group_admin, :agency_admin ]

  # - Relationships -
  has_many :user_roles
  has_many :users, :through => :user_roles

  # - Class Methods -
  class << self

    ROLES.each do |role|
      define_method( role ) do
        find_by_name role.to_s.camelcase
      end
    end

  end

end

user.rb

class User < ActiveRecord::Base

  # - Relationships -
  has_many :user_roles
  has_many :roles, :through => :user_roles

  # - Instance Methods -
  Role::ROLES.each do |role|
    define_method "#{ role }?" do
      role? Role.__send__( role )
    end
  end

end

SO why do you have 2 models, Role and User? I thought u said just a string column..