factories.rb

Factory.define :application do |factory|
  factory.attachment(:sample, "public/samples/sample.doc", "application/msword")
end

factory_attachment.rb

require 'action_controller/test_process'
Factory.class_eval do
  def attachment(name, path, content_type = nil)
    path_with_rails_root = "#{RAILS_ROOT}/#{path}"
    uploaded_file = if content_type
                      ActionController::TestUploadedFile.new(path_with_rails_root, content_type)
                    else
                      ActionController::TestUploadedFile.new(path_with_rails_root)
                    end

    add_attribute name, uploaded_file
  end
end

where do you put the factory_attachment.rb in the init directory?

I don't have the project I originally extracted this from handy, so I'm not sure where exactly I had it.

It doesn't actually matter where it lives, as long as it's required in the factories.rb. You could even just drop it at the top of the file really.

I'll see about gemming this up, which should make it a bit easier :)