def download
    send_file ("#{Rails.root}/public/images/image.jpg")
end

def download
    send_file ("#{Rails.root}/assets/images/image.jpg")
end

def download
    send_file ("#{Rails.root}/images/image.jpg")
end

def download
    send_file ("/public/images/image.jpg")
end

def download
    send_file ("/assets/public/images/image.jpg")
end

def download
    send_file ("/assets/images/image.jpg")
end

ActionController::MissingFile in HomeController#download
Cannot read file 'some_path'

IMAGES_PATH = File.join(Rails.root, "public", "images")

def download
  send_file(File.join(IMAGES_PATH, "image.jpg"))
end

send_file(Rails.root.join('app' , 'assets', 'images', 'image.jpg'))