ruby-on-rails – 在编辑操作中未显示的嵌套图像模型对象

我已经暂时忽略了这个问题,但我不能再这样了.我渲染产品的编辑视图时,我的嵌套图像模型对象product_images没有显示.由于这个原因,我的应用程序调用一个错误,表示当我尝试渲染显示视图时图像为零.

为什么我的嵌套产品图片没有出现？我正在使用paperclip和s3.

我需要嵌套图像表格可编辑,一切都在创建新产品时有效,编辑是唯一的问题. show动作期间的nil例外与编辑动作故障有关

以下是我的代码：

楷模 ##

class ProductImage < ActiveRecord::Base
  attr_accessible :product_id,:photo,:image_width,:image_height
  belongs_to :product
  has_attached_file :photo,:styles => { :small => "150x150>"},:dependent => :destroy

  validates_attachment_presence :photo
  validates_attachment_size :photo,:less_than => 5.megabytes
  validates_attachment_content_type :photo,:content_type => ['image/jpg','image/jpeg','image/png','image/gif']
  after_post_process :save_image_dimensions

  def save_image_dimensions
      geo = Paperclip::Geometry.from_file(photo.queued_for_write[:original])
      self.image_width = geo.width.to_i
      self.image_height = geo.height.to_i
  end
  def sized_different?
  if image_width < image_height
          true
  else
          false

  end
  end
end


class Product < ActiveRecord::Base
  attr_accessible :taxable,:shippable,:page_name,:tact_code,:manu_code,:body_code,:name,:alert,:price,:description,:colors_attributes,:sizes_attributes,:extras_attributes,:restraints_attributes,:product_images_attributes
  validates_presence_of :page_name
  validates_presence_of :price
  validates_presence_of :description
  validates_presence_of :name
  has_many :product_images,:dependent => :destroy
  has_many :restraints,:dependent => :destroy
  has_many :colors,:dependent => :destroy
  has_many :sizes,:dependent => :destroy
  has_many :extras,:dependent => :destroy
  accepts_nested_attributes_for :colors,:sizes,:extras,:restraints,:product_images
end

调节器

def index
          @products = Product.search(params)
      unless current_cart.nil?
          @cart = current_cart
      else
          @cart = nil
      end
  end
  def new
          @product = Product.new
          @product.product_images.build
  end
  def create
          @product = Product.new(params[:product])

          if @product.save
                  render :index
          else
                  render :new
          end
  end
def edit
          @product = Product.find(params[:id])
          @cart = current_cart
  end
  def show
          @product = Product.find(params[:id])
          @cart = current_cart
  end
  def update
          @product = Product.find(params[:id])
          if @product.update_attributes!(params[:product])
            render :index
          else
            render :edit
          end  
   end
end

_form视图

<%= form_for @adminproduct,validate: true,html:{ multipart: true} do |f| %>
  <div class="span3 field">
    <ul class="unstyled">
      <li><%= f.text_field :name,:placeholder => "Product name" %></li>
      <li><%= f.text_field :manu_code,:placeholder => "Manufacturer code" %></li>
      <li><%= f.text_field :alert,:placeholder => "Alert,example: Save 10%" %></li>
      <li><%= f.text_field :price,:placeholder => "Base price"  %></li>
      <li><%= f.text_area :description,:placeholder => "Product description",:size => "30x10" %></li>

</ul>
  </div>
  <div class="span6 offset1">
    <ul class="unstyled">
      <li><%= f.check_box :taxable %>Item can be taxed</li>
      <li><%= f.check_box :shippable%>Item can be standard shipped</li>

      <li><br /><b>Choose product images:</b></li>
      (the first image will be the product's main image)<br/>
      <%= f.fields_for :product_images do |p|%><%= render 'product_image_fields',f: p %><% end %>
            <li><%= link_to_add_fields "Add image",f,:product_images %></li>

任何见解都表示赞赏.

编辑

产品图片偏

<fieldset>
        <%= f.file_field :photo %>
        <%= f.hidden_field :_destroy %>
        <%= link_to "remove",'#',class: "remove_fields" %>
</fieldset>

def edit
  @product = Product.includes(:product_images).find(params[:id])
  # ...
end