player.rb

class Player < Competitor
  belongs_to :team

  attr_accessible :birth_date, :nationality

  def age
    now = Time.now.utc.to_date
    now.year - birth_date.year - ((now.month > birth_date.month || (now.month == birth_date.month && now.day >= birth_date.day)) ? 0 : 1)
  end

  def to_builder
    player = super

    player.(self, :birth_date, :nationality)
    player.race 'Zerg'

    player
  end
end