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

why send instead of send ?

Because I want to keep it as isolated as possible. Perhaps someday I'll have to declare any method with name 'send', and it'll clash.
http://ruby-doc.org/core/classes/Object.src/M000999.html
However, 'send' is fancier than 'send'