ruby-on-rails-4 – 无法使用Paperclip在Rails 4中保存图像属性

我的Rails 4应用程序中有两个相关的模型：product.rb和image.rb. Image模型允许使用Paperclip gem附加文件.

图像属于产品,产品具有多个图像.

我想在创建产品时使用产品的新视图来创建和附加图像.每次我尝试时,与Paperclip图像相关的参数都不会被保存,最终结果为零.

以下是模型：

Product.rb

class Product < ActiveRecord::Base
  validates :name,:part_number,presence: true
  has_many :images,dependent: :destroy
  belongs_to :category
  accepts_nested_attributes_for :images,allow_destroy: true
end

Image.rb

class Image < ActiveRecord::Base
  belongs_to :product
  has_attached_file :image
end

回顾过去的Stack Overflow问题,我发现了一些相关的问题和答案,但没有一个似乎对我的特殊情况有所帮助.到目前为止,我能够使用正确的属性提交文件,但它不会将它们保存到数据库中.

ProductsController的#创建

def create
  @product = Product.new(product_params)
end

def product_params
  params.require(:product).permit(:name,:category_id,images_attributes: [:image])
end

ProductsController的#新

def new
  @product = Product.new
  @categories = # irrelevant to question
end

产品/ new.html.haml

= form_for @product,:html => 
  = f.label :name
  = f.text_field :name
  = f.label :part_number
  = f.text_field :part_number
  = f.label :category_id
  = f.select :category_id,@ca
  = f.fields_for :image do |ff|
    = ff.label :image 
    = ff.file_field :image
  = f.submit('Create Product')

查看参数我可以告诉正确的属性被传递：

示例参数：

{"utf8"=>"?","authenticity_token"=>"jGNy/TasHzP0EcWDFzZ3XH5/fpxb6vD+ncQ2PZSQ3/I=","product"=>{"name"=>"bar","part_number"=>"foo","category_id"=>"30","image"=>{
 "image"=>#<ActionDispatch::Http::UploadedFile:0x007fc82f58e0e0
 @tempfile=#<Tempfile:/var/folders/04/23d9grkj5fv3wkj2t8858kx40000gn/T/RackMultipart20131029-64949-1ldkz4g>,@original_filename="FPE230_b.jpg",@content_type="image/jpeg",@headers="Content-Disposition: form-data; name="product[image][image]"; filename="FPE230_b.jpg"rnContent-Type: image/jpegrn">}},"commit"=>"Create Product"}

但是,图像实际上并未保存到数据库中.我怎么能纠正这个？

编辑

仔细查看日志,我发现我收到了“未经许可的参数：图像”错误.即使将images_attributes：[：image]添加到我的product_params方法后也是如此.

@product = Product.new(product_params)

def product_params
  params.require(:product).permit(:name,images_attributes: [:image])
end

{
   "utf8"=>"?","authenticity_token"=>"7EsPTNXu127itgp4fbohu672/L4XnSwLEkrqUGec3pY=","product"=>{
     "name"=>"whatever","part_number"=>"12345","images_attributes"=>{
       "0"=>{
         "image"=>#<ActionDispatch::Http::UploadedFile:0x007feb0c183b08 
           @tempfile=#<Tempfile:/var/folders/6k/16k80dds0ddd6mhvs5zryh3r0000gn/T/RackMultipart20131031-51205-emaijs>,@original_filename="some-image.png",@content_type="image/png",@headers="Content-Disposition: form-data; name="product[images_attributes][0][image]"; filename="ponysay.png"rnContent-Type: image/pngrn">
        }
      }
    },"commit"=>"Create"}

<%= form_for @product,:url => products_path,:html => { :multipart => true } do |f| %>

<%= f.fields_for :images do |i| %>
  <%= i.file_field :image %>
<% end %>

def new
  @product = Product.new
  @product.images.build
end