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: 20160112153334_change_community_center_to_community_centre.rb
    path of file: ./repos/wheelmap-classic/db/migrate
    
    the code of the file until where you have to start completion: class ChangeCommunityCenterToCommunityCentre < ActiveRecord::Migration
  class L
    
  def down
    node_type = LocalNodeType.find_by_identifier('community_centre')
    if node_type.nil?
      return
    else
      node_type.identifier = 'community_center'
      node_type.osm_value = 'community_center'
      node_type.save
    end