Rails 教程中 Ruby 中 RelationshipsController 的未定义方法 'logged_in_user'

Question

这有点奇怪。我正在浏览 rails 教程中 ruby 的第十二章（供参考：https://www.railstutorial.org/book/following_users），并到达第 12.2.4 节，所有测试都通过了。然后我执行命令 rails generate controller Relationships 并准确输入清单 12.30 和 12.31 中的代码以尝试让关系控制器测试通过，但我收到以下错误：

ERROR["test_destroy_should_require_logged-in_user", RelationshipsControllerTest, 2015-11-13 11:07:25 +0000]
 test_destroy_should_require_logged-in_user#RelationshipsControllerTest (1447412845.16s)
NoMethodError:         NoMethodError: undefined method `logged_in_user' for #<RelationshipsController:0x000000044f5bd8>
            test/controllers/relationships_controller_test.rb:14:in `block (2 levels) in <class:RelationshipsControllerTest>'
            test/controllers/relationships_controller_test.rb:13:in `block in <class:RelationshipsControllerTest>'
        test/controllers/relationships_controller_test.rb:14:in `block (2 levels) in <class:RelationshipsControllerTest>'
        test/controllers/relationships_controller_test.rb:13:in `block in <class:RelationshipsControllerTest>'

ERROR["test_create_should_require_logged-in_user", RelationshipsControllerTest, 2015-11-13 11:07:25 +0000]
 test_create_should_require_logged-in_user#RelationshipsControllerTest (1447412845.22s)
NoMethodError:         NoMethodError: undefined method `logged_in_user' for #<RelationshipsController:0x00000004db9990>
            test/controllers/relationships_controller_test.rb:7:in `block (2 levels) in <class:RelationshipsControllerTest>'
            test/controllers/relationships_controller_test.rb:6:in `block in <class:RelationshipsControllerTest>'
        test/controllers/relationships_controller_test.rb:7:in `block (2 levels) in <class:RelationshipsControllerTest>'
        test/controllers/relationships_controller_test.rb:6:in `block in <class:RelationshipsControllerTest>'

为什么它看不到来自用户控制器的 logged_in_user 方法？我可以把它写成

class RelationshipsController < ApplicationController
  before_action :logged_in_user

  def create
    user = User.find(params[:followed_id])
    current_user.follow(user)
    redirect_to user
  end

  def destroy
    user = Relationship.find(params[:id]).followed
    current_user.unfollow(user)
    redirect_to user
  end

  private

    # Confirms a logged-in user.
    def logged_in_user
      unless logged_in?
        store_location
        flash[:danger] = "Please log in."
        redirect_to login_url
      end
    end
end

并且测试通过了，但是这种行为违反了在整个教程中反复强调的“不要重复自己”原则。知道出了什么问题吗？

Answer 1

那个方法 logged_in_user 是在 UsersController 中还是在 ApplicationsController 中？如果它在 UsersController 中，由于层次继承，它将无法访问它。尝试将该方法放入 ApplicationsController，然后旋转它。

这样做将使 UsersController 和 RelationshipsController 都可以访问此方法，因为它们都继承自 ApplicationsController

Rails 教程中 Ruby 中 RelationshipsController 的未定义方法 'logged_in_user'

Undefined method 'logged_in_user' for RelationshipsController in Ruby on Rails Tutorial

ruby

ruby-on-rails

nomethoderror