tokenable.rb

module Tokenable
  extend ActiveSupport::Concern

  # To add to a model with pre-existing records
  # ModelName.all.each do |i|
  #   i.token = loop do
  #     random_token = SecureRandom.urlsafe_base64(nil, false)
  #     break random_token unless i.class.exists?(token: random_token)
  #   end
  #   i.save!
  # end

  included do
    before_create :generate_token
  end

  protected

  def generate_token
    if !self.token
      self.token = loop do
        random_token = SecureRandom.urlsafe_base64(nil, false)
        break random_token unless self.class.exists?(token: random_token)
      end
    end
  end
end