Hash diff to HTML https://github.com/liufengyun/hashdiff

hash_diff_html.rb

def parse_diff(changes)
  # [["~", "name", "original name", "updated name"]] => {:name => ['original_name', 'updated_name', 'Modify']}
  parsed_diff = {}
  changes.each do |change|
    unless change[1].match(/updated_at/) || change[1].match(/.id/) || change[1].match(/.created_at/)
      if change[1].match(/line_items/) || change[1].match(/site_lists/) || change[1].match(/zip_code_lists/)
        change[1].gsub!(/\d+/, Random.rand(1000).to_s)
      end
      type = if change[0] == "+"
        "Add"
      elsif change[0] == "-"
        "Remove"
      else
        "Modify"
      end
      parsed_diff[change[1]] = [change[2], change[3], type]
    end
  end

  styled_parsed_diff =  "<ul>"
  parsed_diff.each do |key, value|
    nested_items = ""
    if value.first.is_a?(Hash)
      nested_items << "<ul>#{value.last} #{key.titleize} <li>"
      value.first.each do |k, v|
        unless !v.present? || k.match(/created_at/) || k.match(/id/) || k.match(/updated_at/)
          nested_items << "#{k} : #{v}; "
        end
      end
      nested_items << "</li></ul>"
    else
      nested_items << "<li>#{value.last} #{key.titleize}: #{value.first} - #{value[1]} </li>"
    end
    styled_parsed_diff << nested_items
  end
  styled_parsed_diff << "</ul>"
  styled_parsed_diff
end