_file_page_part.html.haml

.row= file_field_tag "page[parts_attributes][#{page_part_counter}][document]"
- if page_part.document.file?
  .row= page_part.document.original_filename

file_page_part.rb

class FilePagePart < PagePart  
  has_attached_file :document

  def render_content
    self.document.url
  end
end

A page part for basic file uploads using Paperclip. Custom page parts consist of a model and a view partial used for the page-edit form.

In this case, the form elements are simply a file field and, if we already have a saved file, its filename. Note the render_content method: when this part is rendered, it will output the path to its file.