Rails 生成 Token 方法

Devise.friendly_token(24).upcase

SecureRandom.hex(24)

self.class.generate_unique_secure_token

class App < ActiveRecord::Base
  has_secure_token :name
end

app = App.new
app.save
app.name # => "BunurUTaTEZbnr1S64Csec9h"
app.regenerate_name # => true