Downloading image or file

class UserController < ApplicationController

def download_image
    @user = User.where(:id => params[:id]).first
    file_path = @user.image_file_name
    if !file_path.nil?
    send_file @user.image.path
   else
       redirect_to :back
   end
   end

end
views
<a href="/download_image/<%=@user.id%>">Download</a><br/>

routes
get "/download_image/:id" => "user#download_image"

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