訪問fields_for hidden_​​field的Rails ID

Question

我通過has_many關聯有一個父對象（full_application）和一個子對象集合（fullapplication_districts）的嵌套表單。我試圖允許刪除窗體上的單個子對象（通過JavaScript），但要做到這一點，我需要能夠獲取視圖中的每個子對象的ID傳遞給控制器​​。 fields_for爲id創建一個隱藏的輸入字段，但我似乎無法弄清楚如何從中獲取id。在下面的例子中，記錄是呈現的子對象列表中的第13位。

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

這裏的視圖的形式設置：

<%= 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。這將返回到fullapplication_district實例。

<%= 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 %>