enum!

ar_playground.rb

#!/usr/bin/env ruby
require 'active_record'

class Thing < ActiveRecord::Base
  belongs_to :group
  enum number: [:a, :b]
end

ActiveRecord::Base.logger = Logger.new(STDOUT)
ActiveRecord::Base.establish_connection(
  :adapter => "sqlite3",
  :database => ":memory:"
)

ActiveRecord::Schema.define do
  create_table :things do |t|
    t.integer :number
  end
end

puts Thing.a.inspect

Gemfile-4.0

gem 'activerecord', '4.0'
gem 'sqlite3'

Gemfile-4.1

gem 'activerecord', '4.1'
gem 'sqlite3'