book_form_with_file_upload.rb

class BookFormWithFileUpload < Netzke::Basepack::Form
  def configure(c)
    super
    c.model = "Book"
  end

  def items
    [{name: 'cover', xtype: :filefield}, *super]
  end

  endpoint :netzke_submit do |params, this|
    super params, this
    # +record+ will contain updated record along with the attachment
  end
end

## MODEL
class Book < ActiveRecord::Base
  attr_accessible :cover
  mount_uploader :cover
end