respond_type.rb

You'll also need a controller to send the photo data when the image is requested by a web browser. This can be done all in one action with respond_to and an extra mime type. In environment.rb, declare the types of the images that you will be serving.

Mime::Type.register "image/jpeg", :jpg
Mime::Type.register "image/png", :png


def show
  @photo = Photo.find params[:id]

  respond_to do |format|
    format.html
    format.jpg do
      send_data @photo.data, {
        :disposition => "inline",
        :type => "image/jpeg"
      }
    end
  end
end