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: 20181113174914_change_strings_to_arrays_on_wiki_pages.rb
    path of file: ./repos/danbooru/db/migrate
    
    the code of the file until where you have to start completion: class ChangeStringsToArraysOnWikiPages < ActiveRecord::Migration[5.2]
  def up
    WikiPage.without_timeout do
      change_column :wiki_pages, :other_names, "text[]", using: "string_to_array(other_names, ' ')::text[]", default: "{}"
      change_column :wiki_page_versions, :other_names, "text[]
    
  def up
    WikiPage.without_timeout do
      change_column :wiki_pages, :other_names, "text[]", using: "string_to_array(other_names, ' ')::text[]", default: "{}"
      change_column :wiki_page_versions, :other_names, "text[]", using: "string_to_array(other_names, ' ')::text[]", default: "{}"

      remove_column :wiki_pages, :other_names_index
      execute "DROP TRIGGER trigger_wiki_pages_on_update_for_other_names ON wiki_pages"

      add_index :wiki_pages, :other_names, using: :gin
    end
  end