ruby-on-rails - Rails "undefined local variable or method"甚至没有被引用的服装

Question

我在这里不知所措。在开发模式(脚本/服务器)下运行时，当我尝试列出多个模型的条目时，随机出现错误“undefined local variable or method 'id' for #<InsertModelNameHere:0x7f19bdb87dc8>”。如果我刷新页面，它工作正常，我假设我只在开发中看到它，因为每个请求都会重新加载所有内容。也许是竞争条件或发生了什么？我什至没有在存在问题的 View 中引用“id”属性(使用不同键命名约定的旧表)，我的一位同事告诉我，rails 将创建一个“id”属性基于模型中定义的主键。

下面是 View 、错误消息和堆栈跟踪的代码。我正在运行 Rails 2.3.3。

查看:

<h2 class="textCenter">To Do List</h2>
<% form_tag({:action => "list"}, :method => "get") do %>
    <div class="full_width textCenter">
        <%= text_field_tag "q", params[:q] %>
        <input type="submit" value="Search" />
    </div>
<% end %>
<table class="full_width list">
    <thead >
        <tr >
            <th >ID</th>
            <th >Name</th>
            <th >Resource ID</th>
            <th >Company</th>
            <th >&nbsp;</th>
            <th >&nbsp;</th>
        </tr>
    </thead>
    <tbody >
        <% begin %>
            <% @todos.each do |todo| %> 
                <tr class="<%= cycle "striped", "" %>" >
                    <td ><%= todo.pk_todo_id %></td>
                    <td ><%= todo.name %></td>
                    <td ><%= todo.fk_resource_id %></td>
                    <td ><%= todo.fk_company_id %></td>
                    <td ><%= link_to "STA", {:controller => "stas", :action => "list", :id => todo.fk_resource_id} %></td>
                    <td ><%= link_to "Edit", {:controller => "todos", :action => "edit", :id => todo.pk_todo_id} %></td>
                </tr>
            <% end %>
        <% rescue => e; puts e.message; puts e.backtrace %>
        <% end %>
    </tbody>
</table>

错误:undefined local variable or method 'id' for #<Todo:0x7f19bdb87dc8>

/var/lib/gems/1.8/gems/activerecord-2.3.3/lib/active_record/attribute_methods.rb:260:in 'method_missing'
/var/lib/gems/1.8/gems/activerecord-2.3.3/lib/active_record/attribute_methods.rb:249:in 'method_missing'
/home/scott/Projects/cllsuite/trunk/app/views/todos/list.rhtml:25:in '_run_rhtml_app47views47todos47list46rhtml'
/home/scott/Projects/cllsuite/trunk/app/views/todos/list.rhtml:23:in 'each'
/home/scott/Projects/cllsuite/trunk/app/views/todos/list.rhtml:23:in '_run_rhtml_app47views47todos47list46rhtml'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_view/renderable.rb:34:in 'send'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_view/renderable.rb:34:in 'render'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_view/base.rb:301:in 'with_template'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_view/renderable.rb:30:in 'render'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_view/template.rb:199:in 'render_template'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_view/base.rb:260:in 'render'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_view/base.rb:343:in '_render_with_layout'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_view/base.rb:257:in 'render'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/base.rb:1246:in 'render_for_file'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/base.rb:941:in 'render_without_benchmark'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/benchmarking.rb:51:in 'render'
/var/lib/gems/1.8/gems/activesupport-2.3.3/lib/active_support/core_ext/benchmark.rb:17:in 'ms'
/usr/lib/ruby/1.8/benchmark.rb:308:in 'realtime'
/var/lib/gems/1.8/gems/activesupport-2.3.3/lib/active_support/core_ext/benchmark.rb:17:in 'ms'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/benchmarking.rb:51:in 'render'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/base.rb:1322:in 'default_render'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/base.rb:1328:in 'perform_action_without_filters'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/filters.rb:617:in 'call_filters'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/filters.rb:610:in 'perform_action_without_benchmark'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/benchmarking.rb:68:in 'perform_action_without_rescue'
/var/lib/gems/1.8/gems/activesupport-2.3.3/lib/active_support/core_ext/benchmark.rb:17:in 'ms'
/usr/lib/ruby/1.8/benchmark.rb:308:in 'realtime'
/var/lib/gems/1.8/gems/activesupport-2.3.3/lib/active_support/core_ext/benchmark.rb:17:in 'ms'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/benchmarking.rb:68:in 'perform_action_without_rescue'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/rescue.rb:160:in 'perform_action_without_flash'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/flash.rb:146:in 'perform_action'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/base.rb:527:in 'send'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/base.rb:527:in 'process_without_filters'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/filters.rb:606:in 'process'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/base.rb:391:in 'process'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/base.rb:386:in 'call'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/routing/route_set.rb:434:in 'call'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/dispatcher.rb:88:in 'dispatch'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/dispatcher.rb:111:in '_call'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/dispatcher.rb:82:in 'initialize'
/var/lib/gems/1.8/gems/activerecord-2.3.3/lib/active_record/query_cache.rb:29:in 'call'
/var/lib/gems/1.8/gems/activerecord-2.3.3/lib/active_record/query_cache.rb:29:in 'call'
/var/lib/gems/1.8/gems/activerecord-2.3.3/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in 'cache'
/var/lib/gems/1.8/gems/activerecord-2.3.3/lib/active_record/query_cache.rb:9:in 'cache'
/var/lib/gems/1.8/gems/activerecord-2.3.3/lib/active_record/query_cache.rb:28:in 'call'
/var/lib/gems/1.8/gems/activerecord-2.3.3/lib/active_record/connection_adapter /abstract/connection_pool.rb:361:in 'call'
/var/lib/gems/1.8/gems/rack-1.0.0/lib/rack/head.rb:9:in 'call'
/var/lib/gems/1.8/gems/rack-1.0.0/lib/rack/methodoverride.rb:24:in 'call'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/params_parser.rb:15:in 'call'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/session/cookie_store.rb:93:in 'call'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/reloader.rb:29:in 'call'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/failsafe.rb:26:in 'call'
/var/lib/gems/1.8/gems/rack-1.0.0/lib/rack/lock.rb:11:in 'call'
/var/lib/gems/1.8/gems/rack-1.0.0/lib/rack/lock.rb:11:in 'synchronize'
/var/lib/gems/1.8/gems/rack-1.0.0/lib/rack/lock.rb:11:in 'call'
/var/lib/gems/1.8/gems/actionpack-2.3.3/lib/action_controller/dispatcher.rb:106:in 'call'
/var/lib/gems/1.8/gems/rails-2.3.3/lib/rails/rack/static.rb:31:in 'call'
/var/lib/gems/1.8/gems/rack-1.0.0/lib/rack/urlmap.rb:46:in 'call'
/var/lib/gems/1.8/gems/rack-1.0.0/lib/rack/urlmap.rb:40:in 'each'
/var/lib/gems/1.8/gems/rack-1.0.0/lib/rack/urlmap.rb:40:in 'call'
/var/lib/gems/1.8/gems/rails-2.3.3/lib/rails/rack/log_tailer.rb:17:in 'call'
/var/lib/gems/1.8/gems/rack-1.0.0/lib/rack/content_length.rb:13:in 'call'
/var/lib/gems/1.8/gems/rack-1.0.0/lib/rack/chunked.rb:15:in 'call'
/var/lib/gems/1.8/gems/rack-1.0.0/lib/rack/handler/mongrel.rb:61:in 'process'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:159:in 'process_client'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in 'each'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in 'process_client'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in 'run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in 'initialize'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in 'new'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in 'run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in 'initialize'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in 'new'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in 'run'
/var/lib/gems/1.8/gems/rack-1.0.0/lib/rack/handler/mongrel.rb:34:in 'run'
/var/lib/gems/1.8/gems/rails-2.3.3/lib/commands/server.rb:111
/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in 'gem_original_require'
/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in 'require'
script/server:3

Answer 1

你在 Todo 上设置了 primary_key 了吗？

class Todo
  set_primary_key 'pk_todo_id'

end

我认为这可能是您的问题。让我知道发生了什么。

祝你好运!