ActiveRecord upsert extension

upsert.rb

module Upsert
  extend ActiveSupport::Concern

  class_methods do
    def upsert(key, attributes)
      begin
        create(attributes)
      rescue ActiveRecord::RecordNotUnique => e
        where(key => attributes[key]).
        first.tap do |obj|
          obj.update(attributes)
        end
      end
    end
  end

end

ActiveRecord::Base.send(:include, Upsert)