Force download files in Ruby on Rails

download.html.haml

= link_to 'Download 1', download_path(:symbol1_name)
= link_to 'Download 2', download_path(:symbol2_name)

download_controller.rb

class DownloadController < ApplicationController

  RESOURCES = {
    symbol1_name: 'filename1.ext',
    symbol2_name: 'filename2.ext'
  }

  def index
    # render view
  end

  def show
    resource = RESOURCES[params[:id].to_sym]
    if resource
      send_file File.join('path', 'to', 'file', resource)
    else
      render nothing: true, status: '404'
    end
  end

end

routes.rb

Application.routes.draw do

  resources :download, only: [:index, :show]

end