engine/app/models/locomotive/editable_file.rb

module Locomotive
  class EditableFile < EditableElement

    mount_uploader :source, EditableFileUploader, :mount_on => :source_filename

    def content
      self.source? ? self.source.url : self.default_content
    end

    def as_json(options = {})
      Locomotive::EditableFilePresenter.new(self).as_json
    end

  end
end