Question

我对rails几乎一无所知，但是这个项目落在我的手上，我必须做一些事情，不是我的运气，它是用铁轨写的！

所以我看了一下代码并尝试模仿我正在工作的这个页面所做的事情，我认为它正在从一个文件夹或某些东西加载一些pdf到div中，不知怎的，我不得不做做同样的事情，但我不知道如何。

结果给了我这个错误：

undefined method `each' for nil:NilClass

和

127:           <tr>
128:         <td><table width="510" border="0" cellpadding="2"   cellspacing="5" bgcolor="#CCCCCC">
129:            
130:          <% for trofeu_rotax_classificas in @trofeu_rotax_classifica %>
131:           <tr>
132:             <td width="22" bgcolor="#333333"><div align="center" class="style4">i</div></td>
133:             <td width="377" bgcolor="#E4E4E4"><span class="style18">    <%= trofeu_rotax_classificas.titulo %></span></td>

和...

/home/korridas/site/app/views/public/trofeu_rotax.html.erb:130:in `_run_erb_app47views47public47trofeu_rotax46html46erb'

任何想法？

我可以根据您需要解决问题来更新帖子

编辑：

/home/korridas/site/app/views/public/trofeu_rotax.html.erb:130:in `_run_erb_app47views47public47trofeu_rotax46html46erb'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_view/renderable.rb:34:in `send'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_view/renderable.rb:34:in `render'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_view/base.rb:306:in `with_template'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_view/renderable.rb:30:in `render'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_view/template.rb:205:in `render_template'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_view/base.rb:265:in `render'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_view/base.rb:348:in `_render_with_layout'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_view/base.rb:262:in `render'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/base.rb:1250:in `render_for_file'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/base.rb:936:in `render_without_benchmark'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/benchmarking.rb:51:in `render'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/activesupport-2.3.8/lib/active_support/core_ext/benchmark.rb:17:in `ms'
/home/korridas/.rvm/rubies/ruby-1.8.7-p374/lib/ruby/1.8/benchmark.rb:308:in `realtime'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/activesupport-2.3.8/lib/active_support/core_ext/benchmark.rb:17:in `ms'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/benchmarking.rb:51:in `render'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/base.rb:1326:in `default_render'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/base.rb:1332:in `perform_action_without_filters'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/filters.rb:617:in `call_filters'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/filters.rb:610:in `perform_action_without_benchmark'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/activesupport-2.3.8/lib/active_support/core_ext/benchmark.rb:17:in `ms'
/home/korridas/.rvm/rubies/ruby-1.8.7-p374/lib/ruby/1.8/benchmark.rb:308:in `realtime'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/activesupport-2.3.8/lib/active_support/core_ext/benchmark.rb:17:in `ms'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/rescue.rb:160:in `perform_action_without_flash'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/flash.rb:151:in `perform_action'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/base.rb:532:in `send'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/base.rb:532:in `process_without_filters'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/filters.rb:606:in `process'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/base.rb:391:in `process'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/base.rb:386:in `call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/routing/route_set.rb:438:in `call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/dispatcher.rb:87:in `dispatch'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/dispatcher.rb:121:in `_call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/dispatcher.rb:130:in `build_middleware_stack'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/activerecord-2.3.8/lib/active_record/query_cache.rb:29:in `call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/activerecord-2.3.8/lib/active_record/query_cache.rb:29:in `call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/activerecord-2.3.8/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/activerecord-2.3.8/lib/active_record/query_cache.rb:9:in `cache'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/activerecord-2.3.8/lib/active_record/query_cache.rb:28:in `call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/activerecord-2.3.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/string_coercion.rb:25:in `call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/rack-1.1.6/lib/rack/head.rb:9:in `call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/rack-1.1.6/lib/rack/methodoverride.rb:24:in `call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/params_parser.rb:15:in `call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/session/cookie_store.rb:99:in `call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/failsafe.rb:26:in `call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/rack-1.1.6/lib/rack/lock.rb:11:in `call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/rack-1.1.6/lib/rack/lock.rb:11:in `synchronize'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/rack-1.1.6/lib/rack/lock.rb:11:in `call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/actionpack-2.3.8/lib/action_controller/dispatcher.rb:106:in `call'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/passenger-4.0.37/lib/phusion_passenger/rack/thread_handler_extension.rb:77:in `process_request'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/passenger-4.0.37/lib/phusion_passenger/request_handler/thread_handler.rb:142:in `accept_and_process_next_request'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/passenger-4.0.37/lib/phusion_passenger/request_handler/thread_handler.rb:110:in `main_loop'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/passenger-4.0.37/lib/phusion_passenger/request_handler.rb:448:in `start_threads'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/passenger-4.0.37/lib/phusion_passenger/request_handler.rb:442:in `initialize'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/passenger-4.0.37/lib/phusion_passenger/request_handler.rb:442:in `new'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/passenger-4.0.37/lib/phusion_passenger/request_handler.rb:442:in `start_threads'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/passenger-4.0.37/lib/phusion_passenger/request_handler.rb:441:in `times'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/passenger-4.0.37/lib/phusion_passenger/request_handler.rb:441:in `start_threads'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/passenger-4.0.37/lib/phusion_passenger/request_handler.rb:440:in `synchronize'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/passenger-4.0.37/lib/phusion_passenger/request_handler.rb:440:in `start_threads'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/passenger-4.0.37/lib/phusion_passenger/request_handler.rb:205:in `main_loop'
/home/korridas/.rvm/gems/ruby-1.8.7-p374/gems/passenger-4.0.37/helper-scripts/classic-rails-preloader.rb:187

整个html位：

<tr>
    <td><table width="510" border="0" cellpadding="0" cellspacing="5" bgcolor="#333333">
      <tr>
        <td><a href="/trofeu_rotax_classificacoes"><span class="style6">CLASSIFICAÇÕES</span></a></td>

      <tr>
    <td><table width="510" border="0" cellpadding="2" cellspacing="5" bgcolor="#CCCCCC">

      <% for trofeu_rotax_classificas in @trofeu_rotax_classifica %>
      <tr>
        <td width="22" bgcolor="#333333"><div align="center" class="style4">i</div></td>
        <td width="377" bgcolor="#E4E4E4"><span class="style18"><%= trofeu_rotax_classificas.titulo %></span></td>
        <% unless(trofeu_rotax_classificas.file.blank?) %>
        <td width="91" bgcolor="#FF0000"><div align="center"><span class="style5"><%= link_to("download PDF", trofeu_rotax_classificas.file.url, :class => "style5") %></span></div></td>
        <% end %>
      </tr>
      <% end %>
    </table></td>
  </tr>


      </tr>
    </table></td>
  </tr>

还有这些文件，我认为代码参考：

<table>
<tr>
<th class="th_id"><span>Id</span></th>
<th>Titulo</th>
<th class="th_actions"><span>Actions</span></th>
</tr>

<% @trofeu_rotax_classificas.each do |trofeu_rotax_classificas| %>
<tr>
  <td class="td_id"><%=h trofeu_rotax_classificas.id %></td>
  <td><%=h trofeu_rotax_classificas.titulo %></td>
  <td>
      <%= link_to image_tag('cms/edit.png'), trofeu_rotax_classificas_path(trofeu_rotax_classificas) %>
      <%= link_to image_tag('cms/delete.png'), trofeu_rotax_classificas, :confirm => 'Tem a certeza que deseja apagar este item?', :method => :delete %>
  </td>
 </tr>
 <% end %>
 </table>

和

<% form_for(@trofeu_rotax_classificas, :html => { :multipart => true }) do |f| %>
  <%= f.error_messages %>

  <p>
    <%= f.label :titulo %><br />
    <%= f.text_field :titulo %>
  </p>
  <p>
    <%= f.label :file %><br />
    <%= link_to("Ficheiro", @trofeu_rotax_classificas.file.url) unless(@trofeu_rotax_classificas.file.blank?) %><br />
    <%= upload_column_field 'trofeu_rotax_classificas', 'file'  %>
  </p>
  <p>
    <%= f.submit 'Create' %>
  </p>
<% end %>

和...

<%= render(:layout => "form") %>

和控制器http://pastebin.com/3hKNWUHY

Answer 1

错误

undefined method `each' for nil:NilClass

表示您正在调用每个nil对象的方法。

在您的情况下，似乎变量@trofeu_rotax_classifica为nil，因此您要在controller

中检查其分配

Answer 2

此变量为零：@trofeu_rotax_classificas。

Rails中的变量在控制器中设置。在您的服务器日志中，应该说Started GET for...然后Processing by <Controller>#<action>。

无论出于何种原因，该控制器都不返回变量。（实例变量，未设置时，默认为nil）

看起来你可能有PublicController？如果是这样，可能存在问题所在。

每个未定义的方法用于轨道中的nil

2 个答案: