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: 20131210181901_migrate_word_counts.rb
    path of file: ./repos/discourse/db/migrate
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

class MigrateWordCounts < ActiveRecord::Migration[4.2]
  disable_ddl_transaction!

  def up
    post_ids =
      execute("SELECT id FROM posts WHERE wor
    
  def up
    post_ids =
      execute("SELECT id FROM posts WHERE word_count IS NULL LIMIT 500").map { |r| r["id"].to_i }
    while post_ids.length > 0
      3.times do
        begin
          execute "UPDATE posts SET word_count = COALESCE(array_length(regexp_split_to_array(raw, ' '),1), 0) WHERE id IN (#{post_ids.join(",")})"
          break
        rescue PG::Error
          # Deadlock. Try again, up to 3 times.
        end
      end