Rails 访问 fields_for hidden_field id

Question

我有一个嵌套表单，其中包含一个父对象 (full_application) 和一个子对象集合 (fullapplication_districts)，通过 has_many 关联。我试图允许删除表单上的单个子对象（通过 javascript），但要这样做我需要能够获取视图中每个子对象的 ID 以传递给控制器。 fields_for 为 id 创建了一个隐藏的输入字段，但我似乎无法弄清楚如何从中获取 id。在下面的示例中，记录是呈现的子对象列表中的第 13 个。

<input type="hidden" value="538" name="full_application[fullapplication_districts_attributes][12][id]" id="full_application_fullapplication_districts_attributes_12_id">

视图中的表单设置如下：

<%= form_for(@full_application, url: full_applications_edit_path, method: :put) do |f| %>
  <%= f.fields_for :fullapplication_districts do |fad| %>
    <%= fad.collection_select :district_id, District.all, :id, :name, {include_blank: true}, {class: 'form-control'} %>
    <%= fad.number_field :percent_one, class: 'form-control', step: :any %>
    <%= fad.number_field :percent_two, class: 'form-control', step: :any %>
    <%= fad.number_field :percent_three, class: 'form-control', step: :any %>
    <%= link_to full_applications_districts_path(???), method: :delete, remote: true, data: { confirm: "Are you sure you want to delete this record?" } do %>
      <i class="fa fa-trash"></i>
    <% end %>
  <% end %>
<% end %>

Answer 1

您可以使用：fad.object 或 fad.object.id。这将 return 到 fullapplication_district 实例。

 <%= link_to full_applications_districts_path(fad.object), method: :delete, remote: true, data: { confirm: "Are you sure you want to delete this record?" } do %>
    <i class="fa fa-trash"></i>
 <% end %>

Rails 访问 fields_for hidden_field id

Rails accessing fields_for hidden_field id

ruby-on-rails

nested-forms

fields-for