class AddCreatedByToForumThreads < ActiveRecord::Migration
  def up
    add_column :forum_threads, :user_id, :integer

    execute "update forum_threads t
    set user_id = (select user_id from posts where forum_thread_id = t.Id order by post_number asc limit 1)"

    change_column :forum_threads, :user_id, :integer, null: false
  end

  def down
    remove_column :forum_threads, :user_id
  end

end
