问我想加密密码，就像devise gem和签入数据库一样

EN

class User < ActiveRecord::Base  
  before_save :encrypt_password
  validates_confirmation_of :password
  validates_presence_of :password, :on => :create

  def encrypt_password
    if password.present?
      self.password_salt = BCrypt::Engine.generate_salt
      self.password_hash = BCrypt::Engine.hash_secret(password,password_salt)
    end
  end
end