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我有一个 Recipe 模型和 RecipePhoto 模型。我想在创建新食谱时显示缩放图像的缩略图。我通过 jquery-file-upload 上传照片。问题是我不知道如何获取上传照片的 ID。

例子：

用户正在创建新配方。他加载了一张照片并在服务器上裁剪，他在提交食谱之前看到了缩略图预览。

recipes_controller.rb

 def new
    @recipe = Recipe.new
    @recipe_photo = RecipePhoto.new
  end

食谱/new.html.slim

= simple_form_for @recipe, :html => {:class => 'add-recipe-form'} do |recipe|
  .form-inputs
    = recipe.input :title

  .form-actions
  = recipe.submit "Create recipe"

= form_for @recipe_photo do |f|

  .form-inputs
    = f.label :image, "Upload paintings:"
    = f.file_field :image, multiple: false

recipe_photo.js.coffee（在这里我只能得到文件名，不能得到record_id）

$ ->
  $('.new_recipe_photo').fileupload
    dataType: "script"
    done: (e, data) ->
      console.log data.files[0], data.files[0].name

recipe_photo.rb

class RecipePhoto < ActiveRecord::Base
  attr_accessible :recipe_id, :image

  belongs_to :recipe

  mount_uploader :image, RecipeImageUploader


end
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