RailsTutorial Chapter 8 参数个数错误（1 for 2）

Question

我卡在第 8 章的末尾，收到以下错误消息：

test_authenticated?_should_return_false_for_a_user_with_nil_digest#UserTest ArgumentError: wrong number of arguments (2 for 1)

app/models/user.rb:36:in `authenticated?'

test/models/user_test.rb:65:in `block in '

教程说我应该通过它（绿色）。非常感谢您的帮助

user.rb file is:

class User < ActiveRecord::Base
  attr_accessor :remember_token
  before_save { self.email = email.downcase }
  validates :name,  presence: true, length: { maximum: 50 }
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
  validates :email, presence: true, length: { maximum: 255 },
                    format: { with: VALID_EMAIL_REGEX },
                    uniqueness: { case_sensitive: false }
  has_secure_password
  validates :password, presence: true, length: { minimum: 6 }

  # Returns the hash digest of the given string.
  def User.digest(string)
    cost = ActiveModel::SecurePassword.min_cost ? BCrypt::Engine::MIN_COST :
                                                  BCrypt::Engine.cost
    BCrypt::Password.create(string, cost: cost)
  end

  # Returns a random token.
  def User.new_token
    SecureRandom.urlsafe_base64
  end

  # Remembers a user in the database for use in persistent sessions.
  def remember
    self.remember_token = User.new_token
    update_attribute(:remember_digest, User.digest(remember_token))
  end

   # Forgets a user.
  def forget
    update_attribute(:remember_digest, nil)
  end

  # Returns true if the given token matches the digest.
  def authenticated?(remember_token)
    return false if remember_digest.nil?
    BCrypt::Password.new(remember_digest).is_password?(remember_token)
  end
end

user_test.rb is (64-66):

test "authenticated? should return false for a user with nil digest" do
        assert_not @user.authenticated?(:remember, '')
end

Answer 1

您的 authenticated? 方法签名采用一个参数，从

可以明显看出

def authenticated?(remember_token)
    return false if remember_digest.nil?
    BCrypt::Password.new(remember_digest).is_password?(remember_token)
  end

但是你传递的是 2。下面这位...

test "authenticated? should return false for a user with nil digest" do
        assert_not @user.authenticated?(:remember, '')
end

应该是

test "authenticated? should return false for a user with nil digest" do
        assert_not @user.authenticated?(:remember)
end

Answer 2

您已将 authenticated? 方法定义为接受单个参数：

def authenticated?(remember_token)

然而你的测试用两个调用它：

@user.authenticated?(:remember, '')

Answer 3

我找到了正确答案 - 清单 8.43：应该是

test "authenticated? should return false for a user with nil digest" do
    assert_not @user.authenticated?('')
end

不要从 Michael Hartl 的 github 复制代码，网站和 repo 之间有太多不一致之处。

RailsTutorial Chapter 8 参数个数错误（1 for 2）

RailsTutorial Chapter 8 wrong number of arguments (1 for 2)

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