ruby-on-rails - Ruby on Rails 教程第 11 章 : Rspec tests fail on follower/following section

Question

我正在研究 Chapter 11在 Hartl 的教程中，试图让用户 Controller 中的未登录用户访问关注者和关注页面通过。我遇到了一个错误，Rails 会提示未定义的 admin? 方法，尽管它只在 User 部分中使用。

Rails 本地服务器

Rendered users/_user.html.erb (9.4ms)
Rendered users/show_follow.html.erb within layouts/application (33.0ms)
Completed 500 Internal Server Error in 43ms

ActionView::Template::Error (undefined method `admin?' for nil:NilClass):
    1: <li>
    2:   <%= gravatar_for user, size: 52 %>
    3:   <%= link_to user.name, user %>
    4:   <% if current_user.admin? && !current_user?(user) %>
    5:     | <%= link_to 'delete', user, method: :delete,
    6:                                   data: { confirm: 'Are you sure?' } %>
    7:   <% end %>
  app/views/users/_user.html.erb:4:in `_app_views_users__user_html_erb___4000670281664801561_70099451578240'
  app/views/users/show_follow.html.erb:25:in `_app_views_users_show_follow_html_erb__2024448610717183111_70099484108000'
  app/controllers/users_controller.rb:68:in `followers'

RSpec 失败

 1) Authentication authorization for non-logged-in users in the Users controller visiting the following page
     Failure/Error: it { should have_selector('title', text: 'Login') }
       expected css "title" with text "Login" to return something
     # ./spec/requests/authentication_pages_spec.rb:122:in `block (6 levels) in <top (required)>'

  2) Authentication authorization for non-logged-in users in the Users controller visiting the followers page
     Failure/Error: it { should have_selector('title', text: 'Login') }
       expected css "title" with text "Login" to return something
     # ./spec/requests/authentication_pages_spec.rb:127:in `block (6 levels) in <top (required)>'

authorization_pages_spec.rb

  describe "authorization" do
    .
    .
    .
    describe "for non-logged-in users" do
      let(:user) { FactoryGirl.create(:user) }
      .
      .
      .
      describe "in the Users controller" do
        .
        .
        .
        describe "visiting the following page" do
          before { visit following_user_path(user) }
          it { should have_selector('title', text: 'Login') }
        end

        describe "visiting the followers page" do
          before { visit followers_user_path(user) }
          it { should have_selector('title', text: 'Login') }
        end
      end

show_follow.html.erb

<% provide(:title, @title) %>
<div class="row">
  <aside class="span4">
    <section>
      <%= gravatar_for @user %>
      <h1><%= @user.name %></h1>
      <span><%= link_to "view my profile", @user %></span>
      <span><b>Posts:</b> <%= @user.posts.count %></span>
    </section>
    <section>
      <%= render 'shared/stats' %>
      <% if @users.any? %>
        <div class="user_avatars">
          <% @users.each do |user| %>
            <%= link_to gravatar_for(user, size: 30), user %>
          <% end %>
        </div>
      <% end %>
    </section>
  </aside>
  <div class="span8">
    <h3><%= @title %></h3>
    <% if @users.any? %>
      <ul class="users">
        <%= render @users %>
      </ul>
      <%= will_paginate %>
    <% end %>
  </div>
</div>

_user.html.erb

<li>
  <%= gravatar_for user, size: 52 %>
  <%= link_to user.name, user %>
  <% if current_user.admin? && !current_user?(user) %>
    | <%= link_to 'delete', user, method: :delete, 
                                  data: { confirm: 'Are you sure?' } %>
  <% end %>
</li>

我尝试从教程本身复制并粘贴所有有问题的文件，但无济于事。提到通过将 :admin 属性分配给 User 类，可以使用 admin? 方法。我猜是我将 nil 对象传递给了部分对象，但我在调试发生这种情况的确切位置时遇到了麻烦。

Answer 1

好吧，我终于明白了。

我忘记将 :following 和 :followers 操作放在 before_filter 中，用于 :logged_in_user用户 Controller 。

class UsersController < ApplicationController
  before_filter :logged_in_user, 
                only: [:index, :edit, :update, :destroy, :following, :followers]

这花了一段时间。