rails 3, paperclip (& formtastic) - 删除图片附件 [英] rails 3, paperclip (& formtastic) - deleting image attachments

问题描述

我似乎无法找到所有组件都完整的示例.我很难删除图片附件

I can't seem to find an example that is complete in all the components. I am having a hard time deleting image attachments

1. 课程

  class Product
    has_many :product_images, :dependent => :destroy
    accepts_nested_attributes_for :product_images
  end

  class ProductImage
    belongs_to :product
    has_attached_file :image #(etc)
  end

查看

View

  <%= semantic_form_for [:admin, @product], :html => {:multipart => true} do |f| %>
    <%= f.inputs "Images" do %>
      <%= f.semantic_fields_for :product_images do |product_image| %>
        <% unless product_image.object.new_record? %>
          <%= product_image.input :_destroy, :as => :boolean, 
             :label => image_tag(product_image.object.image.url(:thumb)) %>
        <% else %>
          <%= product_image.input :image, :as => :file, :name => "Add Image" %>
        <% end %>
      <% end %>
    <% end %>
  <% end %>

控制器

Controller

  class Admin::ProductsController < AdminsController
   def edit
     @product = Product.find_by_permalink(params[:id])
     3.times {@product.product_images.build} # added this to create add slots
   end

   def update
      @product = Product.find_by_permalink(params[:id])

      if @product.update_attributes(params[:product])
        flash[:notice] = "Successfully updated product."
        redirect_to [:admin, @product]
      else
        flash[:error] = @product.errors.full_messages
        render :action => 'edit'
      end
    end
  end

看起来不错，但是，当我选中复选框时，实际上没有任何反应.在请求中我看到:

Looks good, but, literally nothing happens when I check the checkbox. In the request I see:

      "product"=>{"manufacturer_id"=>"2", "size"=>"", "cost"=>"5995.0", 
         "product_images_attributes"=>{"0"=>{"id"=>"2", "_destroy"=>"1"}}

但没有更新，产品图片也没有保存.

But nothing gets updated and the product image is not saved.

我是否遗漏了有关accepts_nested_attributes_for"工作原理的一些基本知识?

Am I missing something fundamental about how 'accepts_nested_attributes_for' works?

推荐答案

来自 ActiveRecord::NestedAttributes::ClassMethods

:allow_destroy

:allow_destroy

如果为 true，则使用 _destroy 键和计算结果为 true 的值(例如 1、‘1’、true 或 ‘true’)销毁属性哈希中的任何成员.此选项默认关闭.

If true, destroys any members from the attributes hash with a _destroy key and a value that evaluates to true (eg. 1, ‘1’, true, or ‘true’). This option is off by default.

所以:

accepts_nested_attributes_for :product_images, allow_destroy: true

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