轨道教程 第 8 章. 迈克尔·哈特尔 - 未定义的方法 remember_token.

Question

我正在关注迈克尔·哈特尔(Michael Hartl(的 railstutorial.org，并在登录后试图记住用户时在第8章中遇到了障碍。问题是我remember_token得到了一个未定义的方法。我已经完成并重新完成了所有步骤，多次重置/回滚数据库并重新迁移，浏览了我能找到的所有堆栈溢出问题，但没有任何效果。

此外，我还对语法进行了三重检查，它列出了教程中所示的内容。该程序能够创建用户，在注册和注销后显示用户配置文件。当我注销并尝试为该用户重新登录时，未知方法会标记。堆栈溢出上的很多答案都说数据库中没有匹配的模式，但是我已经重新迁移并检查了它，一切都是匹配的。包括几个DB：drop命令，然后是DB：migrate。

教程给我带来麻烦的部分从 8.4.1 记住令牌和摘要开始，第 8 章链接：https://www.railstutorial.org/book/log_in_log_out

我很感激你的帮助，似乎不能休息一下！ 完整的错误消息：错误消息的图片

**Error message received through the test:**
ERROR["test_login_with_valid_inforamtion_followed_by_logout", UsersLoginTest, 2016-01-20 10:04:41 +0000]
 test_login_with_valid_inforamtion_followed_by_logout#UsersLoginTest (1453284281.57s)
NoMethodError:         NoMethodError: undefined method `remember_token=' for #<User:0x00000009688838>
            app/models/user.rb:28:in `remember'
            app/helpers/sessions_helper.rb:10:in `remember'
            app/controllers/sessions_controller.rb:10:in `create'
            test/integration/users_login_test.rb:24:in `block in <class:UsersLoginTest>'
        app/models/user.rb:28:in `remember'
        app/helpers/sessions_helper.rb:10:in `remember'
        app/controllers/sessions_controller.rb:10:in `create'
        test/integration/users_login_test.rb:24:in `block in <class:UsersLoginTest>'

用户.rb 文件

 class User < ActiveRecord::Base
  attr_accessor :remeber_token
 #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 persisten sessions
  def remember
    self.remember_token = User.new_token
    update_attribute(:remember_digest, User.digest(remember_token))
  end
  def authenticated?(remember_token)
    BCrypt::Password.new(remember_digest).is_password?(remember_token)
  end
end 

users_controller.rb

class UsersController < ApplicationController
  def show
    @user = User.find(params[:id])
  end
  def new
    @user = User.new
  end
  def create
    @user = User.new(user_params)
    if @user.save
      log_in @user
      flash[:success] = "Welcome to the Sample App!"
      redirect_to @user
    else
      render 'new'
    end
  end
  private 

    def user_params
      params.require(:user).permit(:name, :email, :password, :password_confirmation)
    end
end

sessions_controller

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
    redirect_to root_url
  end
end

sessions_helper.rb

module SessionsHelper
  # Logs in the given user.
  def log_in(user)
    session[:user_id] = user.id
  end
  # Remembers a user in a persistent session.
  def remember(user)
    user.remember
    cookies.permanent.signed[:user_id] = user.id
    cookies.permanent[:remember_token] = user.remember_token
  end
  # Returns the user corresponding to the remember token cookie.
  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
  # Returns true if the user is logged in, false otherwise.
  def logged_in?
    !current_user.nil?
  end
  # Logs out the current user.
  def log_out
    session.delete(:user_id)
    @current_user = nil
  end
end

_add_remember_digest_to_users.rb

class AddRememberDigestToUsers < ActiveRecord::Migration
  def change
    add_column :users, :remember_digest, :string
  end
end

Answer 1

attr_accessor ：remeber_token

你有一个错别字。

上面的代码需要是：

attr_accessor :remember_token