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: wiki_page.rb
    path of file: ./repos/moebooru/app/models
    
    the code of the file until where you have to start completion: class WikiPage < ApplicationRecord
  acts_
    
  def unlock!
    self.is_locked = false

    transaction do
      execute_sql("UPDATE wiki_pages SET is_locked = FALSE WHERE id = ?", id)
      execute_sql("UPDATE wiki_page_versions SET is_locked = FALSE WHERE wiki_page_id = ?", id)
    end
  end