Mysql 用户#索引中的参数错误

显示/home/bdme551/bdme21/app/views/users/index.html.erb，其中第4行出现：

@users变量似乎为空。您是否忘记传递will_paginate的收集对象？ 提取的源（第4行附近）：

控制台日志

 ActionView::Template::Error (The @users variable appears to be empty. Did you forget to pass the collection object for will_paginate?):
    1: <% provide(:title, 'All users') %>
    2: <h1>All users</h1>
    3: 
    4: <%= will_paginate %>
    5: 
    6: <ul class="users">
    7:   <% @users.each do |user| %>

app/views/users/index.html.erb:4:in `_app_views_users_index_html_erb__4020588401683243365_70237529196060'
  Rendering /home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout
  Rendering /home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_source.html.erb
  Rendered /home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_source.html.erb (6.7ms)
  Rendering /home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb
  Rendered /home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (3.0ms)
  Rendering /home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb
  Rendered /home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.9ms)
  Rendered /home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout (32.0ms)
DEPRECATION WARNING: #original_exception is deprecated. Use #cause instead. (called from process_request at /usr/lib/ruby/vendor_ruby/phusion_passenger/rack/thread_handler_extension.rb:97)
  Rendering /home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/index.html.erb
  Rendered /home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/_markup.html.erb (0.9ms)
  Rendering /home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/console.js.erb within layouts/javascript
  Rendering /home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/_inner_console_markup.html.erb within layouts/inlined_string
  Rendered /home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/_inner_console_markup.html.erb within layouts/inlined_string (0.7ms)
  Rendering /home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/_prompt_box_markup.html.erb within layouts/inlined_string
  Rendered /home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/_prompt_box_markup.html.erb within layouts/inlined_string (0.4ms)
  Rendering /home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/style.css.erb within layouts/inlined_string
  Rendered /home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/style.css.erb within layouts/inlined_string (0.8ms)
  Rendered /home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/console.js.erb within layouts/javascript (22.3ms)
  Rendering /home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/main.js.erb within layouts/javascript
  Rendered /home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/main.js.erb within layouts/javascript (0.5ms)
  Rendered /home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/index.html.erb (39.0ms)

ActionView:：Template:：Error（@users变量似乎为空。是否忘记传递will_paginate的集合对象？）
1: 
2：所有用户
三：
4: 
5: 
6:

7:   
app/views/users/index.html.erb:4:in`_app\u views\u users\u index\u html\u erb\u 4020588401683243365\u 70237529196060'
rescues/layout中的Rendering/home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action\u dispatch/middleware/templates/rescues/template\u error.html.erb
Rendering/home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action\u dispatch/middleware/templates/rescues//u source.html.erb
Rendered/home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action\u dispatch/middleware/templates/rescues//u source.html.erb（6.7ms）
Rendering/home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action\u dispatch/middleware/templates/rescues//u trace.html.erb
Rendered/home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action\u dispatch/middleware/templates/rescues//u trace.html.erb（3.0ms）
Rendering/home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action\u dispatch/middleware/templates/rescues//u request\u and\u response.html.erb
Rendered/home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action\u dispatch/middleware/templates/rescues//u request\u and\u response.html.erb（1.9ms）
rescues/layout中的Rendered/home/bdme551/.rvm/gems/ruby-2.3.1/gems/actionpack-5.0.0.1/lib/action\u dispatch/middleware/templates/rescues/template\u error.html.erb（32.0ms）
弃用警告：#原始_异常已弃用。用“原因”代替。（从/usr/lib/ruby/vendor\u ruby/phusion\u passenger/rack/thread\u handler\u extension.rb:97的进程请求调用）
Rendering/home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/index.html.erb
Rendered/home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web\u console/templates//u markup.html.erb（0.9ms）
布局/javascript中的Rendering/home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/console.js.erb
Rendering/home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web\u console/templates//u internal\u console\u markup.html.erb在布局/内联\u字符串中
Rendered/home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web\u console/templates//u internal\u console\u markup.html.erb在布局/内联字符串中（0.7ms）
Rendering/home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web\u console/templates//u prompt\u box\u markup.html.erb在布局/内联\u字符串中
布局/内联字符串（0.4ms）中的Rendered/home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web\u console/templates//u prompt\u box\u markup.html.erb
布局/内联字符串中的Rendering/home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web\u console/templates/style.css.erb
布局/内联字符串中的Rendered/home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web\u console/templates/style.css.erb（0.8ms）
layouts/javascript中的Rendered/home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/console.js.erb（22.3ms）
布局/javascript中的Rendering/home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/main.js.erb
layouts/javascript中的Rendered/home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/main.js.erb（0.5ms）
Rendered/home/bdme551/.rvm/gems/ruby-2.3.1/gems/web-console-3.1.1/lib/web_console/templates/index.html.erb（39.0ms）

尝试像这样在索引操作中获取用户集合

@users = User.all.paginate(:page => params[:page], :per_page => 2) 

然后在index.html.erb中执行此操作

<%= will_paginate @users %>

---

尝试在每页添加

def index
  @users = User.paginate(page: params[:page], per_page: 5) 
end

并将

@users

变量传递给

will\u paginate

<%= will_paginate @users %>

---

为index.html.erb尝试以下代码：

<% provide(:title, 'All users') %>
<h1>All users</h1>

<%= will_paginate %>

<ul class="users">
   <% @users.each do |user| %>
      <%= render user %>
   <% end %>
</ul>

<%= will_paginate %>

所有用户

对于app/views/users/_user.html.erb，类似于此

<li>
   <%= link_to user.name, user %>
</li>

如果只删除分页，会发生什么

假设您在视图的第4行丢失了“will_paginate”

您将控制器的操作从

@users=User.paginate（第页：参数[：页]，每页：5）

公正

@users=User.all

---

我知道您希望分页工作正常，但是让我们从已知的好东西开始，以迭代的方式工作，以获得您需要的工作解决方案。您说您有两个用户，但是User.all找到了吗？

将以下内容添加到文件中

gem'will_paginate'，“~>3.1.0'

---

然后运行

bundle install

将对@users进行分页。在

用户

控制器的

索引

操作中会发生什么情况？@Deepak我尝试过。它不起作用。我更新了问题。用户表中有记录吗？看起来您得到的结果是空的。我已经按照要求包含了控制台日志。在更正用户控制器后，我仍然得到相同的ArguementError.Yes。结果没有变化。我在上面的问题中更新了控制台日志和其他代码。请尽可能复习一下。谢谢。我添加了您的代码，如上所述。我仍然在用户索引中发现ArgumentError。我更新了控制台日志和上面问题中的其他代码。请尽可能复习一下。谢谢。您也可以尝试在用户控制器的“索引”描述中写入@users=User.paginate（page:params[：page]），而不是@users=User.all.paginate（page:params[：page]）。感谢您的建议。我试过了。我仍然收到相同的错误消息-ArguementError in Users#index。我也在做很多研究。希望在此之前有人能帮助我。谢谢ag

<% provide(:title, 'All users') %>
<h1>All users</h1>

<%= will_paginate %>

<ul class="users">
   <% @users.each do |user| %>
      <%= render user %>
   <% end %>
</ul>

<%= will_paginate %>

<li>
   <%= link_to user.name, user %>
</li>