ruby-on-rails – 无法以活动的管理嵌套形式更新回形针图像

我有模型产品和产品图片. Product_images是一种回形针模型.产品有很多product_images.我正在制作一个Active Admin表单,上传多个图像并将这些图像显示在Products视图页面上.

但是,当我保存产品时.产品表已更新,但不是product_image表.图像正常附加,但我无法更新已上传图像的字段.

class Product < ActiveRecord::Base
    attr_accessible :name,:product_images_attributes 
      has_many :product_images,:dependent => :destroy
      accepts_nested_attributes_for :product_images,:reject_if => lambda { |t| t['product_image'].nil? },:allow_destroy => true
end

class Productimage < ActiveRecord::Base
    attr_accessible :name,:style
    attr_accessible :image 
    belongs_to :product
    has_attached_file :image,:styles => { :small => "150x150>",:large => "320x240>" }
    validates_attachment_presence :image
end

ActiveAdmin.register Product do
form :html => { :multipart => true } do |f|
    f.inputs "Admin Details" do
      f.input :name
    end
    f.inputs "Product images" do        
        f.has_many :product_images do |p|
            p.input :style,:as => :select,:collection => Image::STYLES,:include_blank => false
            p.input :image,:as => :file,:label => "Image",:hint => p.object.image.nil? ? p.template.content_tag(:span,"No Image Yet") : p.template.image_tag(p.object.image.url(:small))
            p.input :_destroy,:as=>:boolean,:required => false,:label => 'Remove image'
        end 
    end
    f.buttons
end

UPDATE

在产品模型中我做：

after_update :check

  def check
    if Productimage.find_by_product_id(self.id).changed?
      raise "image"
    else
      raise "fail"
    end   
  end

它总是提高“失败”

解决方法

您可以通过添加以下内容将ActiveRecord配置为级联保存对模型集合中项目的更改：autosave =>声明关联时的true选项.

尝试：

has_many :product_images,:dependent => :destroy,:autosave => true

此外,您可以在after_save回调中将表数据保存在关联中,如下所示：

class Product < ActiveRecord::Base
    attr_accessible :name,:allow_destroy => true

       after_save :do_product_image_update

private
    def do_product_image_update
       self.product_images.save
    end

end