Renaming files on response for expiring url.

gistfile1.rb

# encoding: UTF-8

class Report < ActiveRecord::Base

  has_attached_file :file, :path => "/:statistic_report_root/:year/:id_partition.pdf"

end

reports_controller.rb

class ReportsController < ApplicationController

  def download
    report = Report.find(params[:id])
    
    options = {expires: 100, :response_content_type => "application/vnd.ms-excel", response_content_disposition: "'attachment; filename=test.xls'"}
    
    redirect_to report.pdf.s3_object.url_for(:read, options).to_s
  end
  
end