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如果某个人的关系不存在,如何显示形式领域
原标题:How to show a form field if none exists in a has_one relationship

我有一张铁路表格,有菜单,这些菜单都有价格和价格评论(斜线)。 然而,我们的数据目前没有价格信息。 我将如何根据守则调整以下内容,以建设这一体系?

<%= form.fields_for :menu_items do |mi| %>
  <div id= menu-item-<%=mi.object.id %> >
  <%= mi.text_field :header, :size => 75 %>
      <%=mi.fields_for :price do |p| %>
        price: <%=p.text_field :price %>
        price comment:<%=p.text_field :price_comment %>
     提炼;% 端&; 
  </div>

提炼;% 端&;

th

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