Mongoid 和 has_secure_password

我正在尝试使用 mongoid 而不是活动模型来使用 Rails 3.1 身份验证

 class User 
  include Mongoid::Document
  include ActiveModel::SecurePassword
  has_secure_password  
  validates_presence_of :password, :on => :create
  attr_accessor :email, :password, :password_confirmation 
  field :email, :type => String
  field :password_digest, :type => String
 end

问题是bycrypt 无法识别password_digest，如活动模型示例中所示http://railscasts.com/episodes/270-authentication-in-rails-3-1 http://railscasts.com/episodes/270-authentication-in-rails-3-1

Thanks

对于任何有兴趣的人来说，使用的最低要求has_secure_passwordMongoid 只是包含ActiveModel::SecurePassword在模型中。

class User
  include Mongoid::Document
  include ActiveModel::SecurePassword

  field :username
  field :password_digest

  has_secure_password
end

Article http://z.calepin.co/rails-31s-has_secure_password-with-monogid.html