h2. Example : role_string

Creates and uses a single role name, a string

<pre>
  class User
    include RoleModels::Generic 

    attr_accessor :name, :role_string

    role_strategy :role_string, :default

    roles :admin, :user

    def initialize name, *new_roles
      self.name = name
      self.roles = new_roles
    end 
  end
</pre>