gistfile1.txt

# using after_save (this works)

class GameObserver < ActiveRecord::Observer
  observe :game
  
  def after_save(game)
    game.record_win_or_tie
  end
end

class Game < ActiveRecord::Base
 
  def record_win_or_tie
    return if @inside_callback
    @inside_callback = true
  
    if home_team_score > away_team_score 
      update_attributes(:home_team_won => true)
    end      
  end
  
end


# before_save doesn't save the home_team_won

class GameObserver < ActiveRecord::Observer
  observe :game
  
  def before_save(game)
    game.record_win_or_tie
  end
end

class Game < ActiveRecord::Base
 
 def record_win_or_tie
    home_team_won = true if home_team_score > away_team_score 
  end
  
end