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我試圖用sinatra來構建[Ryan Bates的'從頭開始的身份驗證]] [1]，但驗證不起作用。我收到一個「未定義的方法password_hash」錯誤。未定義的方法`password_hash'數據映射器的錯誤
其他所有工作。我檢查了datamapper文檔，特別是對於懶加載，但找不到任何有用的東西。代碼如下。我在做什麼錯誤？
main.rb的（僅適用於相關的部分）
post "/login" do
user = User.authenticate params[:email], params[:password]
if user
session[:user_id] = user.id
redirect "/"
else
session[:errors] = "No such user or bad password."
redirect "/login"
end
end
user.rb
require 'data_mapper'
require 'dm-validations'
require 'bcrypt'
module Kimsin
DataMapper.setup :default, 'sqlite3:///home/barerd/RProjects/kimsin/users.db'
class User
attr_accessor :password, :confirm_password
include DataMapper::Resource
property :id, Serial
property :email, String, :required => true, :unique => true, :format => :email_address,
:messages => { :presence => "We need your email address.", :is_unique => "We already have that email.", :format => "Doesn't look like an email adress.."}
property :password_salt, String
property :password_hash, String, :length => 80
validates_presence_of :password, :confirm_password, :messages => { :presence => "You have to type a password and confirm it." }
validates_format_of :password, :confirm_password, :with => /^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])([\x20-\x7E]){8,40}$/, :messages => { :format => "The password should be 8 to 40 characters long and contain at least one digit, one lowercase and one uppercase letter and one special character." }
before :save, :encrypt_password
def self.authenticate email, password
user = User.all :email.like => email
if user && user.password_hash == BCrypt::Engine.hash_secret(password, user.password_salt)
user
else
nil
end
end
def encrypt_password
if password != nil
self.password_salt = BCrypt::Engine.generate_salt
self.password_hash = BCrypt::Engine.hash_secret password, password_salt
end
end
end
DataMapper.finalize
end