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Does the Ruby on Rails CarrierWave gem work with Ajax?
Parameters: {"item"=>{"remote_image_url"=>""}}

<%= form_for(@item, :url => create_item_path, :html => {:id => "create_item_form", :multipart => true}) do |f| %>
    <p>
      <%= f.file_field :image %>
    </p>
    <p>
      <%= f.label :remote_image_url, "or image URL" %><br />
      <%= f.text_field :remote_image_url %>
    </p>
    <%= f.submit "Save", :id => "save_button" %>
<% end %>

$("#create_item_form").submit(function() {
    $.ajax({
      type: "POST",
      url: $(this).attr("action"),
      dataType: "script",
      data:  $("#destination_item").sortable('serialize') + "&" + $(this).serialize()
      });
      return false;
});

class Item < ActiveRecord::Base
  attr_accessible :description, :image, :remote_image_url
  belongs_to :user
  has_many :item_sub
  mount_uploader :image, ImageUploader
end

create_table "item", :force => true do |t|
    t.integer  "user_id"
    t.string   "title"
    t.string   "image"
    t.datetime "created_at"
    t.datetime "updated_at"
  end