“TasksController＃update中的NoMethodError” - 为什么？

时间：2011-07-01 16:05:14

标签： ruby-on-rails ruby ruby-on-rails-3 nested-forms

我正在学习Rails（所以这可能是一个愚蠢的错误）。我正在尝试编写一个同时更新父级及其子级的编辑屏幕。当我点击保存时，我得到：

NoMethodError in TasksController#update
undefined method `to_sym' for #<Arel::Attributes::Integer:0x00000004d11970>

我无法弄清楚是什么导致了这个以及这个整数对象在哪里/是什么。任何人都可以给我任何指示吗？

编辑：如果我从头开始使用新的Rails项目，我可以完成这项工作。引发错误的参数是关键字“flactions_attributes”下的参数。似乎缺少一些值，但这不是问题。

详细

父模型是Task，子模型是Flaction。 （从我这里拿走它，你不想在Rails中命名一个表'action'）。

错误页面也有助于显示params哈希（请原谅我的'喜剧'测试数据。）：

{"utf8"=>"✓",
 "_method"=>"put",
 "authenticity_token"=>"QS1gVSz+LKNIyBsIdnSMVfciBA+3j0nFK37477A7mps=",
 "task"=>{"name"=>"Finish secret lair",
 "description"=>"",
 "flactions_attributes"=>{"0"=>{"name"=>"Choose a colour scheme",
 "notes"=>"Ask The Voices?",
 "id"=>"80"},
 "1"=>{"name"=>"Pick a name",
 "notes"=>"Something with skulls in it?",
 "id"=>"81"}}},
 "x"=>"3",
 "y"=>"14",
 "id"=>"53"}

这是控制器中的更新方法。 AFAICS完全是香草：

def update
  @task = Task.find(params[:id])

  respond_to do |format|
    if @task.update_attributes(params[:task])
      format.html { redirect_to(@task, :notice => 'Task was successfully updated.') }
      format.xml  { head :ok }
    else
      format.html { render :action => "edit" }
      format.xml  { render :xml => @task.errors, :status => :unprocessable_entity }
    end
  end
end

所以：@ task.update_attributes找到一个整数并尝试在其上运行to_sym。我传递给update_attributes的唯一东西是params，并且那里没有整数键。我如何弄清楚发生了什么？

这是_form文件，FWIW：

<%= form_for(@task) do |f| %>

  <% if @task.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@task.errors.count, "error") %> prohibited this task from being saved:</h2>

      <ul>
        <% @task.errors.full_messages.each do |msg| %>
          <li><%= msg %></li>
        <% end %>
      </ul>
    </div>
  <% end %>


  <div class="<%= @task.hold ? 'task held' : 'task' %>" >

    <div class="field name">
      <%= f.text_field :name, size: 20 %>

      <span class="buttons">
        <%= if @task.hold
              link_to image_tag('unhold-icon.png', alt: 'Un-hold'), change_hold_task_path(@task)
            else
              link_to image_tag('hold-icon.png', alt: 'Hold'), change_hold_task_path(@task)
        end %>

        <%= link_to image_tag('delete-icon.png', alt: 'Delete'), @task, confirm: 'Are you sure?', method: :delete %>
      </span>
    </div>

    <div class="field desc">
      <%= f.text_area :description, rows: 3, cols: 95 %>
    </div>


    <table>
      <% f.fields_for :flactions do |a| %>
        <tr>
          <td class="field"> <%= a.text_field :name %> </td>
          <td class="field"> <%= a.text_area :notes, rows: 2, columns: 40 %> </td>

          <td class="buttons">
            <%= link_to image_tag("up-icon-small.png", alt: 'Move Up'), move_flaction_path(a.object, direction: "up") %>
            <%= link_to image_tag("down-icon-small.png", alt: 'Move Down'), move_flaction_path(a.object, direction: "down") %>
            <%= link_to image_tag("delete-icon-small.png", alt: 'Delete'), a.object,  :confirm => 'Are you sure?', :method => :delete %>
          </td>
        </tr>
      <% end # f.fields_for %>

    </table>

    <%= image_submit_tag('save-icon.png', alt: 'Save') %>
  </div> <!-- of div.task or div.task_held -->

<% end %>

编辑：根据要求进行堆栈跟踪：

activerecord (3.0.8) lib/active_record/base.rb:1267:in `block in     expand_hash_conditions_for_aggregates'
activerecord (3.0.8) lib/active_record/base.rb:1266:in `each'
activerecord (3.0.8) lib/active_record/base.rb:1266:in `expand_hash_conditions_for_aggregates'
activerecord (3.0.8) lib/active_record/relation/query_methods.rb:225:in `build_where'
activerecord (3.0.8) lib/active_record/relation/query_methods.rb:76:in `where'
activerecord (3.0.8) lib/active_record/relation/spawn_methods.rb:124:in `apply_finder_options'
activerecord (3.0.8) lib/active_record/relation/finder_methods.rb:143:in `all'
activerecord (3.0.8) lib/active_record/nested_attributes.rb:364:in `assign_nested_attributes_for_collection_association'
activerecord (3.0.8) lib/active_record/nested_attributes.rb:254:in `flactions_attributes='
activerecord (3.0.8) lib/active_record/base.rb:1564:in `block in attributes='
activerecord (3.0.8) lib/active_record/base.rb:1560:in `each'
activerecord (3.0.8) lib/active_record/base.rb:1560:in `attributes='
activerecord (3.0.8) lib/active_record/persistence.rb:131:in `block in update_attributes'
activerecord (3.0.8) lib/active_record/transactions.rb:292:in `block in with_transaction_returning_status'
activerecord (3.0.8) lib/active_record/connection_adapters/abstract/database_statements.rb:139:in `transaction'
activerecord (3.0.8) lib/active_record/transactions.rb:207:in `transaction'
activerecord (3.0.8) lib/active_record/transactions.rb:290:in `with_transaction_returning_status'
activerecord (3.0.8) lib/active_record/persistence.rb:130:in `update_attributes'
app/controllers/tasks_controller.rb:62:in `block in update'
actionpack (3.0.8) lib/action_controller/metal/mime_responds.rb:264:in `call'
actionpack (3.0.8) lib/action_controller/metal/mime_responds.rb:264:in `retrieve_response_from_mimes'
actionpack (3.0.8) lib/action_controller/metal/mime_responds.rb:191:in `respond_to'
app/controllers/tasks_controller.rb:61:in `update'
actionpack (3.0.8) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.0.8) lib/abstract_controller/base.rb:150:in `process_action'
actionpack (3.0.8) lib/action_controller/metal/rendering.rb:11:in `process_action'
actionpack (3.0.8) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.0.8) lib/active_support/callbacks.rb:436:in `_run__950750868564864989__process_action__1833593346352443574__callbacks'
activesupport (3.0.8) lib/active_support/callbacks.rb:410:in `_run_process_action_callbacks'
activesupport (3.0.8) lib/active_support/callbacks.rb:94:in `run_callbacks'
actionpack (3.0.8) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.0.8) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.0.8) lib/active_support/notifications.rb:52:in `block in instrument'
activesupport (3.0.8) lib/active_support/notifications/instrumenter.rb:21:in `instrument'
activesupport (3.0.8) lib/active_support/notifications.rb:52:in `instrument'
actionpack (3.0.8) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.0.8) lib/action_controller/metal/rescue.rb:17:in `process_action'
actionpack (3.0.8) lib/abstract_controller/base.rb:119:in `process'
actionpack (3.0.8) lib/abstract_controller/rendering.rb:41:in `process'
actionpack (3.0.8) lib/action_controller/metal.rb:138:in `dispatch'
actionpack (3.0.8) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.0.8) lib/action_controller/metal.rb:178:in `block in action'
actionpack (3.0.8) lib/action_dispatch/routing/route_set.rb:62:in `call'
actionpack (3.0.8) lib/action_dispatch/routing/route_set.rb:62:in `dispatch'
actionpack (3.0.8) lib/action_dispatch/routing/route_set.rb:27:in `call'
rack-mount (0.6.14) lib/rack/mount/route_set.rb:148:in `block in call'
rack-mount (0.6.14) lib/rack/mount/code_generation.rb:93:in `block in recognize'
rack-mount (0.6.14) lib/rack/mount/code_generation.rb:68:in `optimized_each'
rack-mount (0.6.14) lib/rack/mount/code_generation.rb:92:in `recognize'
rack-mount (0.6.14) lib/rack/mount/route_set.rb:139:in `call'
actionpack (3.0.8) lib/action_dispatch/routing/route_set.rb:493:in `call'
actionpack (3.0.8) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
actionpack (3.0.8) lib/action_dispatch/middleware/head.rb:14:in `call'
rack (1.2.3) lib/rack/methodoverride.rb:24:in `call'
actionpack (3.0.8) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.0.8) lib/action_dispatch/middleware/flash.rb:182:in `call'
actionpack (3.0.8) lib/action_dispatch/middleware/session/abstract_store.rb:149:in `call'
actionpack (3.0.8) lib/action_dispatch/middleware/cookies.rb:302:in `call'
activerecord (3.0.8) lib/active_record/query_cache.rb:32:in `block in call'
activerecord (3.0.8) lib/active_record/connection_adapters/abstract/query_cache.rb:28:in `cache'
activerecord (3.0.8) lib/active_record/query_cache.rb:12:in `cache'
activerecord (3.0.8) lib/active_record/query_cache.rb:31:in `call'
activerecord (3.0.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:354:in `call'
actionpack (3.0.8) lib/action_dispatch/middleware/callbacks.rb:46:in `block in call'
activesupport (3.0.8) lib/active_support/callbacks.rb:416:in `_run_call_callbacks'
actionpack (3.0.8) lib/action_dispatch/middleware/callbacks.rb:44:in `call'
rack (1.2.3) lib/rack/sendfile.rb:107:in `call'
actionpack (3.0.8) lib/action_dispatch/middleware/remote_ip.rb:48:in `call'
actionpack (3.0.8) lib/action_dispatch/middleware/show_exceptions.rb:47:in `call'
railties (3.0.8) lib/rails/rack/logger.rb:13:in `call'
rack (1.2.3) lib/rack/runtime.rb:17:in `call'
activesupport (3.0.8) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.2.3) lib/rack/lock.rb:11:in `block in call'
<internal:prelude>:10:in `synchronize'
rack (1.2.3) lib/rack/lock.rb:11:in `call'
actionpack (3.0.8) lib/action_dispatch/middleware/static.rb:30:in `call'
railties (3.0.8) lib/rails/application.rb:168:in `call'
railties (3.0.8) lib/rails/application.rb:77:in `method_missing'
railties (3.0.8) lib/rails/rack/log_tailer.rb:14:in `call'
rack (1.2.3) lib/rack/content_length.rb:13:in `call'
rack (1.2.3) lib/rack/handler/webrick.rb:52:in `service'
/usr/lib/ruby/1.9.2-p180/webrick/httpserver.rb:111:in `service'
/usr/lib/ruby/1.9.2-p180/webrick/httpserver.rb:70:in `run'
/usr/lib/ruby/1.9.2-p180/webrick/server.rb:183:in `block in start_thread'

1 个答案:

答案 0 :(得分：0)

GOT IT！这为迄今为止最不实用的Rails错误赢得了个人奖金。

问题是因为我在模型中编写了自己的Task.flactions方法。删除后，它工作正常。所以，还有一件事要记住永远不要再做了：不要覆盖Rails为你创建的方法。

顺便说一下，据我所知，目前记录的Rails 3中唯一的父母子窗体位于ri form_for。那里也有例子。值得一看。

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