tokenable.rb

tokenable.rb

module Tokenable
  extend ActiveSupport::Concern
 
  module ClassMethods
    def token(name)
      name = name.to_sym
 
      validates name, uniqueness: true, allow_nil: true
 
      define_token_methods(name) do
        rand.to_s[2..7]
      end
    end
 
    private
 
    def define_token_methods(name, &generator)
      define_method(:"generate_#{name}") do
        loop do
          random_token = generator.call
          return random_token unless self.class.exists?(name => random_token)
        end
      end
 
      define_method(:"generate_#{name}!") do
        update_attribute(:"#{name}", public_send(:"generate_#{name}"))
      end
    end
  end
end