Question

我的测试之一在Hartl的Rails教程第8章中收到以下错误。

>  1) Error:
> UsersLoginTest#test_login_with_valid_information_followed_by_logout:
> NoMethodError: undefined method `forget' for #<Class:0x000000079be3b0>
>     app/helpers/sessions_helper.rb:30:in `forget'
>     app/helpers/sessions_helper.rb:37:in `log_out'
>     app/controllers/sessions_controller.rb:18:in `destroy'
>     test/integration/users_login_test.rb:40:in `block in <class:UsersLoginTest>'

我尝试过完全按照教程中的方式复制和粘贴代码，但它似乎并没有解决问题。

这是我的Sessions Helper

module SessionsHelper
  def log_in(user)
    session[:user_id] = user.id
  end

  def remember(user)
    user.remember
    cookies.permanent.signed[:user_id] = user.id
    cookies.permanent[:remember_token] = user.remember_token
  end

  def current_user
    if (user_id = session[:user_id])
      @current_user ||= User.find_by(id: user_id)
    elsif (user_id = cookies.signed[:user_id])
      user = User.find_by(id: user_id)

      if user && user.authenticated?(cookies[:remember_token])
        log_in user
        @current_user = user
      end
    end
  end


  def logged_in?
    !current_user.nil?
  end

  def forget(user)
    user.forget
    cookies.delete(:user_id)
    cookies.delete(:remember_token)
  end

  # Logs out the current user.
  def log_out
    forget(current_user)
    session.delete(:user_id)
    @current_user = nil
  end 
end

我的会话控制器低于

class SessionsController < ApplicationController
  def new
  end

  def create
    user = User.find_by(email: params[:session][:email].downcase)

    if user && user.authenticate(params[:session][:password])
      log_in user
      remember user
      redirect_to user
    else
      flash.now[:danger] = 'Invalid email/password combination'
      render 'new'
    end
  end

  def destroy
    log_out if logged_in?
    redirect_to root_url
    end
  end

非常感谢任何建议！

Answer 1

在这里，我们可以看到真正仔细查看错误消息的重要性。它说有一个“没有方法错误”。好。所以我们正在与用户做一些事情并没有方法。用户是建模用户，所以让我们看一下app / models / user.rb：

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

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

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

我们看到最后，有一个名为“忘记”的方法

def forget
  #something
end

这打开了来自其他控制器和帮助程序的调用方法，您已经在“会话”部分中创建了该方法。

Hartl Rails教程第8.46章NoMethodError

1 个答案: