You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: product.rb
    path of file: ./repos/bootcamp/app/models
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

class Pro
    
  def update_last_commented_at(comment)
    if comment
      if comment.user.mentor
        update_columns(mentor_last_commented_at: comment.updated_at) # rubocop:disable Rails/SkipsModelValidations
      elsif comment.user == user
        update_columns(self_last_commented_at: comment.updated_at) # rubocop:disable Rails/SkipsModelValidations
      end