Question

我有两个表（副词，单词）和两个控制器（副词，单词）。我希望有一个表单来添加和编辑两个表的记录。副词控制器：

class AdverbsController < ApplicationController
  def new
         @adverb=Adverb.new
  end
  def create
    @adverb=Adverb.create(params[:adverb])

    if   @adverb.save
      redirect_to :action => 'index'
    else
      render :action => 'new'
    end
  end
  def index
        @adverb =Adverb.find(:all)
  end
  def edit
        @adverb =Adverb.find(params[:id])
  end
  def update

    if @adverb.update_attributes(params[:adverb])
      redirect_to :action => 'index'
    else
      redirect_to :action => 'edit'
    end
  end
end

和单词控制器：

class WordsController < ApplicationController
  def new
         @word=Word.new

  end
  def create
    @word=Word.create(params[:word])

    if @word.save
      redirect_to :action => 'index'
    else
      render :action => 'new'
    end
  end
  def index
        @word=Word.find(:all)
  end
  def edit
        @word=Word.find(params[:id])
  end
  def update

    if @word.update_attributes(params[:word])
      redirect_to :action => 'index'
    else
      redirect_to :action => 'edit'
    end
  end
end

我使用Partial form

<html>


<div id="tabs">
     <ul>
       <li><a href="#tabs-1">word</a> </li>
       <li><a href="#tabs-2">Adverb</a> </li>
     </ul>
     <div id="tabs-1">
       <table >
        <tr>
          <td align="right">
            Artikel :
          </td>
          <td align="center">
            <%= w.label :Artikel ,'der' %><%= w.radio_button :Artikel,'der',:checked =>false%>
            <%= w.label :Artikel ,'die' %><%= w.radio_button :Artikel,'die',:checked =>true %>
            <%= w.label :Artikel ,'das' %><%= w.radio_button :Artikel,'das',:checked =>false %>
          </td>
        </tr>
        <tr>
          <td align="right">
            Neues Wort:
          </td>
          <td>
             <%= w.text_field :Name ,:size => '31*45'%>
          </td>
        </tr>

         <tr>
          <td align="right">
            Synonome :
          </td>
          <td>
             <%= w.text_field :syn ,:size => '31*45'%>
          </td>
        </tr>

        <tr>
          <td align="right">
            Bedeutung :
          </td>
          <td>
             <%=  w.text_area :bedeutung , :size =>'30*45' %>
          </td>
        </tr>
        <tr>
          <td align="right">
              Beispiel :
          </td>
          <td>
            <%= w.text_field :beispiel ,:size => '31*45' %>
          </td>
        </tr>
        <tr>
          <td>
             Kommentar:
          </td>
          <td>
            <%= w.text_area :kommentar ,:size =>'30*45' %>
          </td>
        </tr>
        <tr>
          <td align="center">
              <%= w.submit submit_lable %>

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

       <div id="tabs-2">
               <%= fields_for (@adverb) do |av| %>
               <table>
                 <tr>
                   <td align="right">
                     Adverb :
                   </td>
                   <td>
                      <%= av.text_field :name %>
                   </td>
                 </tr>
                 <tr>
                   <td align="right">
                     Bedeutung :
                   </td>
                   <td>
                     <%=  av.text_field :bedeutung %>
                   </td>
                 </tr>
                 <tr>
                   <td align="right">
                     Synonome :
                   </td>
                   <td>
                      <%= av.text_field :syn %>
                   </td>
                 </tr>
                 <tr>
                   <td>
                        <%= w.submit submit_lable %>
                   </td>
                 </tr>
               </table>

              <% end %>
             </div>
   </div>
</html>

和我的new.html.erb：

<html>
<body>
<%= form_for(@word) do |w| %>
<%= render :partial => 'form',:locals => {:w =>w,:submit_lable =>'mmmm'} %>
<% end %>
</body>
</html>

但发生了错误：

NoMethodError in Words#new

Showing /home/babak/kurs/app/views/words/_form.erb where line #197 raised:

undefined method `model_name' for NilClass:Class

我该如何解决我的问题？谢谢你的帮助

Answer 1

我认为在获取单词controller的新动作时会引发此异常。在_form.html.erb中，您有以下代码：

<%= fields_for (@adverb) do |av| %>
  <table>
    <tr>
      <td align="right">
        Adverb :
      </td>
      <td>
        <%= av.text_field :name %>
      </td>
    </tr>
    <tr>
      <td align="right">
        Bedeutung :
      </td>
      <td>
        <%=  av.text_field :bedeutung %>
      </td>
    ...
  </table>
<%= end %>

我看到你的新动作中没有声明@adverb的控制器。实例变量默认为nil，这就是您看到此错误的原因。

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