methods - 未定义方法 `remember_token=' 'find_by_remember_token' - 第 8 章 Ruby on Rails 教程

Question

我正在尝试完成 Michael Hartl 的 Ruby on Rails 教程，但我被困在第 8 章。我在运行测试时遇到了同样的两个错误:

NoMethodError: 未定义的方法 remember_token='
ActionView::Template::Error: 未定义方法find_by_remember_token'

我对编码和编程非常陌生，所以我不确定要发布什么，以便人们可以帮助解决我的问题。我觉得我已经定义了 :remember_token 和 find_by_remember_token。我在下面的代码中包含了 :remember_token 出现的每个实例:

sample_app/app/helpers/sessions_helper.rb:
    2  
    3    def sign_in(user)
    4:     cookies.permanent[:remember_token] = user.remember_token
    5      self.current_user = user
    6    end
    .
   15  
   16    def current_user
   17:     @current_user ||= User.find_by_remember_token(cookies[:remember_token])
   18    end
   19  
   20    def sign_out
   21      self.current_user = nil
   22:     cookies.delete(:remember_token)
   23    end
   24  end

sample_app/app/models/user.rb:
   16  
   17    before_save { |user| user.email = email.downcase }
   18:   before_save :create_remember_token
   19  
   20    validates :name, presence: true, length: { maximum: 50 }
   ..
   27    private
   28  
   29:     def create_remember_token
   30:       self.remember_token = SecureRandom.urlsafe_base64
   31      end
   32  end

sample_app/db/migrate/[timestamp]_add_remember_token_to_users.rb:
    1  class AddRememberTokenToUsers < ActiveRecord::Migration
    2    def change
    3:     add_column :users, :remember_token, :string
    4:     add_index  :users, :remember_token
    5    end
    6  end

sample_app/spec/models/user_spec.rb:
   27    it { should respond_to(:password) }
   28    it { should respond_to(:password_confirmation) }
   29:   it { should respond_to(:remember_token) }
   30    it { should respond_to(:authenticate) }
   31  
   ..
  125    describe "remember token" do
  126      before { @user.save }
  127:     its(:remember_token) { should_not be_blank }
  128    end
  129  end

sample_app/spec/support/utilities.rb:
    7    click_button "Sign in"
    8    # Sign in when not using Capybara as well.
    9:   cookies[:remember_token] = user.remember_token
   10  end`

Answer 1

我也遇到了这个问题。经过一番谷歌搜索后，我发现运行这些终端命令......

rake db:drop
rake db:create
rake db:migrate

...让我重新振作起来。

希望它也对你有用。我知道这有多令人沮丧。