_file_page_part.html.haml

/ Very basic file attachment via a page part. When rendered, this part will
/  output the path to its attached document.

/ Provide a view partial for the page-edit form:

.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

# And the class definition:

class FilePagePart < PagePart  
  has_attached_file :document

  def render_content
    self.document.url
  end
end

# I'm leaving out the creation of the paperclip columns (easy) and any display
# sugar (thumbnail, file removal) but you can see more complete examples at
# http://github.com/digitalpulp/radiant-page-parts-extension