various little cleanups

app/models/historical_game.rb

@@ -16,7 +16,7 @@ def as_json(options = {})
       :change => change,
     }
     (GAME_ATTRIBUTES + PLAYER_ATTRIBUTES).each do |attr|
-      attributes[attr.gsub(/last_/,'')] = self.send(attr) if self.send(attr)
+      attributes[attr.to_s.gsub(/last_/,'')] = self.send(attr) if self.send(attr)
     end
     attributes
   end

app/models/player.rb

@@ -40,6 +40,10 @@ def score_history
     @score_history ||= ScoreHistory.new(self).history
   end
 
+  def avg_games_per_day
+    (p.games.count / (p.games.first.created_at - p.games.last.created_at) / 3600 / 24).round
+  end
+
   def update_rank!(params = {})
     rank = params[:attr] || :rank
     self.last_game_id = params[:game].id if params[:game]

lib/tasks/rescore.rake

@@ -8,6 +8,6 @@ task :rescore, [:initial_score] => :environment do |t, args|
     player.save
   end
 
-  Game.order("created_at ASC").each { |g| g.update_ranks }
+  Game.order("created_at ASC, id ASC").each { |g| g.update_ranks }
 
 end