tracks/tracks/db/migrate/003_created_at.rb

class CreatedAt < ActiveRecord::Migration
  # Current bug in Rails that prevents rename_column working in SQLite
  # if the column names use symbols instead of strings.
  # <http://dev.rubyonrails.org/changeset/2731>
  def self.up
    rename_column :todos, :created, :created_at
  end

  def self.down
    rename_column :todos, :created_at, :created
  end
end