Store raw email in attachment with rails

email.rb

# encoding: UTF-8

class Email < ActiveRecord::Base

  has_attached_file :raw

  after_save :remove_file

  # ===========================================================================
  # Public instance methods
  # ===========================================================================

  def mail=(value)
    return unless mail

    @file_name = "#{Dir.tmpdir}/#{mail.object_id}.gzip"
    raw_message = mail.to_s rescue mail.raw_source

    file = File.open(@file_name,"w:ASCII-8BIT") do |f|
      f.write(zip.compress(raw_message))
    end

    raw_file = File.new(@file_name)
    self.raw = raw_file

  ensure
    raw_file.close unless raw_file.closed?
  end

  def mail
    begin
      @mail ||= Mail.new(zip.decompress(tempfile.read))
    ensure
      @tempfile.close! if @tempfile
    end
    @mail
  end

  # ===========================================================================
  # Private instance methods
  # ===========================================================================

  private

  def tempfile
    @tempfile ||= Paperclip.io_adapters.for(self.raw).tempfile
  end

  def zip
    ActiveSupport::Gzip
  end

  def remove_file
    begin
      if @file_name && File.exists?(@file_name)
        #puts "Removing #{@file_name}"
        File.delete(@file_name)
      end
    rescue
      puts "Failed to remove file: #{@file_name} in Email object"
    end
  end