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ペーパークリップを使用して複数のファイルをアップロードする際に問題が発生しました。

私のモデルはそのようなものです

slider has_many imgarrays

imgarrays has_many imageobjects

imageobjects have_attachment(as for paperclip)

単一の画像を受け取り、他のモデルでペーパークリップを使用して保存することに問題はありませんがimgarrays、複数のファイルのアップロード中にparamによって返される配列を処理する方法がわかりません。

これが私のRailsサーバーログです:

Started POST "/slider" for 127.0.0.1 at 2012-07-23 10:14:17 +0800
  Processing by SliderController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"7HcHtSlOsU/bnxb9emhAsSl/GFBraIE6NxwijHl3REM=", "slider"=>{"question"=>"", "answer"=>"", "score"=>"", "industry_name"=>"", 
  "imgarrays"=>[#<ActionDispatch::Http::UploadedFile:0x007fb471e99f30 @original_filename="Icon.png", @content_type="image/png", @headers="Content-Disposition: form-data; name=\"slider[imgarrays][]\"; filename=\"Icon.png\"\r\nContent-Type: image/png\r\n", @tempfile=#<File:/var/folders/2s/n9wb5x4534nfs1cbrlph32v00000gp/T/RackMultipart20120723-53499-1lyi4yf>>, #<ActionDispatch::Http::UploadedFile:0x007fb471e99dc8 @original_filename="Icon@2x.png", @content_type="image/png", @headers="Content-Disposition: form-data; name=\"slider[imgarrays][]\"; filename=\"Icon@2x.png\"\r\nContent-Type: image/png\r\n", @tempfile=#<File:/var/folders/2s/n9wb5x4534nfs1cbrlph32v00000gp/T/RackMultipart20120723-53499-10lala2>>, #<ActionDispatch::Http::UploadedFile:0x007fb471e99d50 @original_filename="greenButton.png", @content_type="image/png", @headers="Content-Disposition: form-data; name=\"slider[imgarrays][]\"; filename=\"greenButton.png\"\r\nContent-Type: image/png\r\n", @tempfile=#<File:/var/folders/2s/n9wb5x4534nfs1cbrlph32v00000gp/T/RackMultipart20120723-53499-or2rdk>>]}, "commit"=>"Create!"}
Completed 500 Internal Server Error in 18ms

ActiveRecord::AssociationTypeMismatch (Imgarray(#70206507050500) expected, got ActionDispatch::Http::UploadedFile(#70206487229960)):
  app/controllers/slider_controller.rb:12:in `new'
  app/controllers/slider_controller.rb:12:in `create'

Rendered /Users/Kinnovate/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.1.1/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.4ms)
Rendered /Users/Kinnovate/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.1.1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.4ms)
Rendered /Users/Kinnovate/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.1.1/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (6.5ms)

スライダーのnew.html.erb

<div>
<%= form_for @slider ,:url=>"/slider" , :html => { :multipart => true } do |f| %>

      <%= f.label :question , "question"%>
      <%= f.text_field :question %> </br>
        <%= f.label :answer , "answer array (comma seperated)"%>
          <%= f.text_field :answer %>   </br>
        <%= f.label :score , "score"%>
     <%= f.text_field :score %> </br>
            <%= f.label :industry_name , "industry"%>
              <%= f.text_field :industry_name %>    </br>

        <%= f.label :attachedimg , "image"%>
         <%= f.file_field :imgarrays, :multiple =>:true %>  </br>

      <%= f.submit "Create", class: "btn btn-large btn-primary" %>
    <% end %>

</div>
<%= link_to 'Cancel', slider_index_path %>
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