Question

我为演示目的简化了更新表单：

class DesignerLayout < ActiveRecord::Base
  has_many :designer_panels, dependent: :destroy
  accepts_nested_attributes_for :designer_panels

_form.html.erb

<%= form_for @designer_layout do |f| %>
  <%= f.fields_for :designer_panels, @designer_layout.designer_panels do |designer_panel_builder| %>
    <%= designer_panel_builder.hidden_field :_destroy %>
    <%= link_to '#', class: 'remove-item' do %>
      <%= content_tag :span %>
    <% end %>
  <% end %>
<% end %>

form.js

$(document).ready(function(){
  $('.remove-item').click(function(){
    $(this).prev('input[type="hidden"]').val("1");
  })
})

以下内容发送到服务器：

Processing by DesignerLayoutsController#update as HTML
   Parameters: { ... "designer_layout"=>{"designer_panels_attributes"=>{"0"=>{"_destroy"=>"1", "id"=>"5"}}} ...

如您所见，具有值“1”的_destroy属性将与特定面板的id一起发送。但是，不删除属于布局的面板。为什么呢？

Answer 1

在模型中设置allow_destroy: true：

accepts_nested_attributes_for :designer_panels, allow_destroy: true

并确保使用强参数<{1}}将_destroy列入白名单：

params.require(:designer_layout).permit(designer_panels_attributes: [:id, :_destroy])

_destroy属性不破坏记录

1 个答案: