diff using paper trail and diff gem

gistfile1.txt

Gemfile

gem 'paper_trail'
gem 'diffy'
gem 'activerecord-diff'

# view

= title "Logs"

h1 Logs

br

<style>#{Diffy::CSS}</style>

table.table.table-striped.table-hover.table-centered.table-condensed
  thead
    tr
      th ID
      th User
      th Event
      th Parent Type
      th Parent ID
      th Datetime
      th Changes
  tbody
    - @versions.each do |version|
      - user = User.find_by_id(version.whodunnit)
      - item = version.item
      tr
        td= version.id
        td= user.try(:full_name)
        td= version.event
        td= version.item_type.downcase
        td= version.item_id
        td= l version.created_at, format: :long
        td
          - version.changeset.each do |k, (old, new)|
            strong= k
            p= diff old, new



# controller
  def logs
    @versions = PaperTrail::Version.order('id desc').page(params[:page]).per(20)
  end

# helper
  def diff(content1, content2)
     changes = Diffy::Diff.new(content1, content2, 
                               include_plus_and_minus_in_html: true, 
                               include_diff_info: true)
     changes.to_s.present? ? changes.to_s(:html).html_safe : 'No Changes'
  end