水豚找不到删除操作的用户

我正在使用RSpec（v. 3.1.0）和Capybara（v. 2.4.3）来测试我的Rails 4应用程序。我的用户删除 spec.rb 包含以下代码：

it "is successful when clicking the destroy link" do
      visit "/users"          
      save_and_open_page
within "#user_#{user.id}" do                        
    click_link "Destroy"            
end
    expect(page).to have_content("User was successfully destroyed.")

水豚抛出以下错误：

 1) Deleting User is successful when clicking the destroy link
 Failure/Error: within "#user_#{user.id}" do
 Capybara::ElementNotFound:
   Unable to find css "#user_509"

Save_and_open_page显示FactoryGirl为测试创建了一个用户。错误消息指示用户的 ID 为 509。我的程序代码（删除方法）按预期工作，因此问题似乎是我的测试代码。我该怎么做才能帮助水豚找到用户？感谢您的任何帮助！

更新：这是HTML源代码：

<!DOCTYPE html>
<html>  
  <head>    
  <title>Users | App </title>
  <link data-turbolinks-track="true" href="/assets/appointments.css?body=1" media="all" rel="stylesheet" />
  <link data-turbolinks-track="true" href="/assets/cardio_exercises.css?body=1" media="all" rel="stylesheet" />
 <link data-turbolinks-track="true" href="/assets/custom.css?body=1" media="all" rel="stylesheet" />
 <link data-turbolinks-track="true" href="/assets/members.css?body=1" media="all" rel="stylesheet" />
 <link data-turbolinks-track="true" href="/assets/sessions.css?body=1" media="all" rel="stylesheet" />
 <link data-turbolinks-track="true" href="/assets/static_pages.css?body=1" media="all" rel="stylesheet" />
 <link data-turbolinks-track="true" href="/assets/strength_exercises.css?body=1" media="all" rel="stylesheet" />
 <link data-turbolinks-track="true" href="/assets/trainers.css?body=1" media="all" rel="stylesheet" />
 <link data-turbolinks-track="true" href="/assets/users.css?body=1" media="all" rel="stylesheet" />
<link data-turbolinks-track="true" href="/assets/application.css?body=1" media="all" rel="stylesheet" />
<script data-turbolinks-track="true" src="/assets/jquery.js?body=1"></script>
<script data-turbolinks-track="true" src="/assets/jquery_ujs.js?body=1"></script>
<script data-turbolinks-track="true" src="/assets/bootstrap.js?body=1"></script>
<script data-turbolinks-track="true" src="/assets/turbolinks.js?body=1"></script>
<script data-turbolinks-track="true" src="/assets/appointments.js?body=1"></script>
<script data-turbolinks-track="true" src="/assets/cardio_exercises.js?body=1"></script>
<script data-turbolinks-track="true" src="/assets/members.js?body=1"></script>
<script data-turbolinks-track="true" src="/assets/sessions.js?body=1"></script>
<script data-turbolinks-track="true" src="/assets/static_pages.js?body=1"></script>
<script data-turbolinks-track="true" src="/assets/strength_exercises.js?body=1"></script>

家

帮助

<div class="container">
  <h1>Listing Users</h1>
<table>
  <thead>
<tr>
  <th>User Name</th>      
  <th>Email</th>
  <th>Member</th> 
  <th>Trainer</th>     
  <th colspan="3"></th>
</tr>
</thead>
<tbody>
   <tr>
    <td>ColeCole</td>        
    <td>xx@xxx.com</td>
    <td>true</td>
    <td>false</td>      
    <td><a href="/users/14">Show</a></td>
    <td><a href="/users/14/edit">Edit</a></td>
    <td><a data-confirm="Are you sure?" data-method="delete" href="/users/14" rel="nofollow">Destroy</a></td>
  </tr>
</tbody>
</table>
<br>
 <a href="/users/new">New User</a>
  <footer class="footer">
 <small>
 The <a href="https://xxxx.herokuapp.com/">xxxx</a>
  by <a href="https://xxxx.herokuapp.com/">xxxx</a>
 </small>
 <nav>
<ul>
  <li><a href="/contact">Contact</a></li>
  <li><a href="/about">About</a></li>
  <li><a href="https://xxxx.herokuapp.com/#">xxxx</a></li>
</ul>
</nav>
</footer>
  <pre class="debug_dump">--- !ruby/hash:ActionController::Parameters
action: index
controller: users
</pre>
</div>
</body>  
</html>

如果页面上只有一个删除按钮，这应该有效：

it "is successful when clicking the destroy link" do
  visit "/users"                                
  click_link "Destroy"           
expect(page).to have_content("User was successfully destroyed.")

编辑：我假设你对CSS选择器不是很熟悉。对于水豚，当你说：

#user_#{user.id}

您不是在抓取诸如"user_509"之类的文本，而是在抓取具有"user_509"标识的 DOM 元素。因此，要让 Capybara 在你的代码中找到该元素，你必须有这样的东西：

<a id="user_509" data-confirm="Are you sure?" data-method="delete" href="/users/14" rel="nofollow">Destroy</a>

仅仅有一个文本字段是不够的，因为文本不是DOM的一部分。

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