Ruby on rails 3 Rails 3与Carrierwave和Simple Form的多态关联

我正在尝试为照片上传建立一个多态关联，这些照片上传是使用Carrierwave处理的。我使用简单表单来构建表单。我觉得关联是正确的，所以我想知道我的问题是否只是表单或控制器的问题

以下是我的联想：

property.rb：

class Property < ActiveRecord::Base
  attr_accessible :image
  ...
  has_many :image, :as => :attachable
  ...
end

来自properties/_form.html.erb的代码段

<%= f.input :image, :label => 'Image:', :as => :file %>

我已尝试更新我的表单以使用字段_，正如我在其他博客中看到的那样：

<%= f.input :image, :label => "Photo", :as => :file %>

<% f.simple_fields_for :images do |images_form| %>
        <%= images_form.input :id, :as => :hidden %>
        <%= images_form.input :attachable_id, :as => :hidden %>
        <%= images_form.input :attachable_type, :as => :hidden %>
        <%= images_form.input :image, :as => :file %>
<% end %>

“Photo”，：as=>：file%>
：隐藏%>
：隐藏%>
：隐藏%>
：文件%>

---

我所知道的是，我要把这件事做好，真是费了好大劲。我对Rails非常陌生，所以即使调试它也很困难。调试器在3.2中不起作用也无济于事：（

因为您的模型有很多：图像（应该是：图像，而不是：图像），所以您希望在视图中使用嵌套的表单。您应该在单元和属性模型上为：图像设置接受嵌套的属性，并将可访问的属性从：图像更改为：图像属性

---

查看有关如何使用它的良好指南。

效果非常好！我唯一需要做的额外事情是在property.rb中设置attr\u accessible:images\u attributes。

def edit
    @property = Property.find params[:id]
    @property.image.build if @property.image.empty?
end

def update
    @property = Property.find params[:id]
    if @property.update_attributes params[:property]
        redirect_to admin_properties_path, :notice => 'The property has been successfully updated.'
    else
        render "edit"
    end
end

<%= f.input :image, :label => 'Image:', :as => :file %>

undefined method `each' for #<ActionDispatch::Http::UploadedFile:0x00000102291bb8>

{"utf8"=>"✓",
 "_method"=>"put",
 "authenticity_token"=>"lvB7EMdc7juip3gBZD3XhCLyiv1Vwq/hIFdb6f1MtIA=",
 "property"=>{"name"=>"Delaware Woods",
 "address"=>"",
 "city"=>"",
 "state"=>"",
 "postal_code"=>"",
 "description"=>"2 bedroom with large kitchen.  Garage available",
 "incentives"=>"",
 "active"=>"1",
 "feature_ids"=>[""],
 "user_ids"=>[""],
 "image"=>#<ActionDispatch::Http::UploadedFile:0x00000102291bb8 @original_filename="wallpaper-4331.jpg",
 @content_type="image/jpeg",
 @headers="Content-Disposition: form-data; name=\"property[image]\"; filename=\"wallpaper-4331.jpg\"\r\nContent-Type: image/jpeg\r\n",
 @tempfile=#<File:/tmp/RackMultipart20120608-3102-13f3pyv>>},
 "commit"=>"Update Property",
 "id"=>"18"}

Can't mass-assign protected attributes: image

<%= f.input :image, :label => "Photo", :as => :file %>

<% f.simple_fields_for :images do |images_form| %>
        <%= images_form.input :id, :as => :hidden %>
        <%= images_form.input :attachable_id, :as => :hidden %>
        <%= images_form.input :attachable_type, :as => :hidden %>
        <%= images_form.input :image, :as => :file %>
<% end %>